Nearly perfect, with just one annoying flaw.
This is actually my favorite flash I've owned (even when comparing the brand name flagship models); the controls are simple and accessible, the build quality is great, and the wireless flash system is a joy to use. My only complaint (I had not seen it mentioned in any review I read) is that when used in slave mode, there is a bright blinking red light to indicate when the flash is ready. It's actually a great feature in some circumstances, but it cannot be disabled (or even made less bright), making it unsuitable and distracting for more subtle situations without using black tape or something to cover it up. I still highly recommend it, just be aware of the blinking red light issue (which hopefully a future firmware update can resolve, as it has with some of their other flashes). The price/performance ratio is incredible!
amazon reviews