Bought to replace a Canon ring flash which are now way too expensive. This budget model has the same feel and build quality of the original Canon model and produces very good results. I've used mine with a Canon 5D and a 50D, with and without a Canon Extension Tube EF12 on both cameras. All of the modes function well and battery consumption so far has been minimal. The ability to vary output between the the two flash elements is essential and works perfectly. The controls are pretty much intuitive if you have any experience of modern flash units (last 10 years). If you do not, there is the small problem of deciphering the mangled English in the instruction booklet, but this really is just a matter of reading it a bit more carefully. The construction feels robust and the step-up rings thread easily onto Canon lenses. Gripes are a) the ring flash sits best with the logo upside down on the lens due to the slightly inflexible lead, but this doesn't alter performance. b) Without an extension tube (or even just a UV filter on the front of a lens) the flash unit can sit uncomfortably close to the camera body. The one thing I'm a bit mystified about is what type of mains adaptor plugs in the side, no mention of it as an accessory in the instruction booklet and I can't see it on Amazon. However, altogether a really good bit of equipment for a relatively small amount of money which means Canon must make a lot of profit on each of their units given what K&F retail this one for. Macro Flash Ring,K&F Concept® KF-150 Ring Flash Light Macro Ring Lite For Canon Camera Canon SLR Cameras EOS 100D 1300D 1200D 550D 600D 650D 700D 750D 760D 70D 60D 50D 40D 7D 6D 1Ds SX50 SX6 70D 5D