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I have had great luck with the Yongnuo line of flash gear. I have 4 of their Speedlites including two of the YN660's, a handful of their wireless triggers, as well as the camera-top transmitter YN560 -TX which can control multiple banks of Speedlites. The only issue I have had with any of the gear is when I had a light stand tip over and one of the 602 II triggers broke apart. I now have that one held together with elastics but it still works :-) The overall build quality is not quite as good as my Canon 580 EX II but it is still not bad. Overall I like the bang for the buck. If you want the absolute top of the line, I would go with the Canon gear but the Yongnuo is a reasonable cheaper option. And specifically the YN660 is great because you can control banks of Speedlites right from your camera top without having to walk right up to them. if you don't need the ETTL feature...this is a great little flash <<>>Works pretty well with the limitations that non-Canon flashes/triggers have anyway and you can't beat the price for the functionality. I have Canon speedlites and pocket wizards but they are expensive and a hassel to setup while these have built-in radios and you can get cheap and simple triggers as well.I bought a pair mostly for shooting real estate and I have shot one house with them. I would give 4 starts but I already have one defective unit out of the box. One worked fine and the other frequently would not fire. It powered on, showed charged and ready but often would only fire after 2-3 presses of the test button. Then it would work correctly until a setting was changed or it sat for a few minutes. I could also see that it was receiving the radio trigger from the indicator light but still not flashing until I had a successful test fire first. This was very frustrating. But, using the other flash, it fired every time without fail. The flaky one is on it's way back to Amazon now and I kept the one that's working. I will probably re-order a second when the refund processes.I still recommend these flashes for the price but make sure you really test them out within the return period. If you have to exchange, no big deal. If one breaks in the future, buying a second or 3rd will still cost less than the name-brand...Great speed light for the price. Compared to the Youngnuo mark iiii these things are a lot bigger. which is not bad but with a battery grip on camera and this flash it does add weight to the camera. Also most precut gels won't work. I control my 660s with the YN560tx and they work great but they will not zoom pass 105mm when controlled by the 560 tx, not a big deal to me at all but when they come out with a 660tx I will upgrade from the 560tx. Last thing. A Nikon or cannon top of the line speed light cost over $600 - $700 I can buy 4 YN660s, 4 battery packs, 4 light stands and 4 NEEWER 32x32 softboxes with removable grids for the price of one Nikon or Cannon speed light. This is a no brainier. These things are built solid, and does not feel cheap. But lets just say within a year they do clunk out. its only $75 I can replace this with out breaking the bank.This is a monster of a flash. Uses the same body as my ettl and hss flagship yn-685. I use it as a reciever flash along with RF-603II transceiver for my canon dslrs. Rarely misfires and reasonable on battery use. Expect 400-450 flashes at 1/8 of power. You are doing something wrong if you need more than 1/8 power indoors out of this flash often. Explore yn-600 rt line If you are new to yn flash equipment instead of this.It seemed to work great for about a week, then quit. In all fairness, the unit worked perfectly in all modes when I removed it from the camera hot shoe. Dazed and frustrated I sent the unit back, but have since determined that the camera hot shoe connection is the culprit, NOT the flash. I shoot almost entirely in manual mode, so this was the perfect flash for me. Once I get the hot shoe dilemma resolved, I will likely re-purchase this flash. It's a big flash with a ton of power, and would suit my needs to a T. Great value for the money too!Love these flashes! They are cheap and with these YN660 matching the power of high end Nikon and Canon flashes with a GN66 guide Number these are definitely worth trying out. They work great with the YN560-TX Flash Trigger. These are manual flashes only, n TTL but that's the best way to shoot a flash when doing studio lighting and it forces you to learn how to properly use a flash.They do warn you in the manual not to shoot continuously on full power or you can burn out the flash but these put out more than enough power at the lower power setting so you can fire away pretty rapidly and still have plenty of light power if you need it.The YN660 is an incredible item with an incredible price tag. It is a significant step up from the 560, which is still a great speedlight, but the 660 starts and responds more quickly and can control other flash groups. Yes, GROUPS.I have a lot of research to do on lights, but I am happy enough with the way the 660’s zoom works with my D7200, and as I read about the features of known speedlights, I find them included on the 660, which just keeps adding to its value. I’m torn whether to buy another 560 or another one of these for my projects.I purchased two YN660 on the very first use one of the Flash got stuck at firing only at 1/1 FULL power. I noticed this during the shoot when my images were fully over exposed and when I check the flashes which were both set to 1/32 power one was firing at FULL power. THank you to Amazon I was able to return the flash. I did order another one in hopes that I do not get another faulty flash.I use TWO YN660 and TWO YN560 IV. I prefer the YN660 due to the fact that the recycle time is a lot quicker on this flash. The flash is bigger and brighter. I prefer the controls on the YN660 over the YN560IV.I already owned a YN660 but having stepped up my game with portraiture photography, i needed another flash, and as its output has a guide No.66 it is very powerful, and I knew it had a quick recycle time and wasnt heavy on battery life , so i got another one of the same type. I control them both via an on camera radio remote, with no need for external receivers as the YN660s have that built in. Ive got no complaints at all and very pleased with the purchase.Very useful and versatile product.Its good1か月ほど使用しております。カメラはパナソニックのDMC-GH4。サードパーティ品なのでもちろんTTLでは使えませんが、マニュアルで十分活用できます。同調速度もSS250までは問題ないようです（使用カメラによって異なります）。ワイヤレスも同様です（別途TXが必要です）。光量1/2ならチャージスピードもそこそこ速い（eneloop pro使用。アルカリ乾電池ではレスポンス遅め）。TXは欠かせないですが、シチュエーションを作り込んで撮影するようなブツ撮りとかなら、特に不満はありません。なお、ハイスピードシンクロ（HSS）には非対応なので、日中のポートレート撮影時の影とりなどや、動きものを止めたりすることができません。人によっては評価が分かれるところかもしれませんね。どこかで見た回転式ダイヤルになった操作系で中々の使い勝手です。チャージも素早いし、純正1台でこれ約3台買えます。
