I've used this flash for almost a year and a half. About every 4 pics I'll get a very underexposed (2 stops) one, causing me some critical missed shots. This has been very frustrating. I sent it in for "service" under warranty. Didn't help. I've experimented with 100s of pics and still have problems, even with all the settings exactly the same. Manual mode seems to work better, but who wants to bother every time I turn the flash on. After these experiences I am thinking about Canon ex430, more expensive, fewer features, but more consistent. Truth is the on camera flash (Digital Rebel) provides better pictures, with much less hassle. Another problem: eats batteries... I would NOT buy this again!