@Sean - I've had the same thing happen to me occasionally. I would hold the power button (typically for about 2 seconds) and it would start to go on, but die. I found that holding the power botton longer (4 sec or so) it starts up just fine.
Apart from the test button from working, it has worked perfectly for me thus far. I use it with the Cactus V5 trigger and has been very reliable. The optical trigger is fine for any indoor use. Plus it has the benefit of having the same head dimensions as the Canon 580EXII so attaching small light modifiers are a breeze. Not counting my studio lights, it's usually the first flash that I reach for (I use all manual).
The photo below was using 2x Vivitar285HV, AB800, and YN560. The key light from above on the subject is from a YN560 off of a reflector []
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