I'm on my 3rd M2-ATX.
First one was bought used, and it was during the first stages of my install. So it received some abuse. And I forgave it for that...

For what ever reason, the peripherals would not turn off, and it wouldn't respond to the power button.
Second was an M2-ATX HV. This failed for no apparent reason. Also with the same peripherals constantly on and no response to the power button. I contacted mini-box about the issue, and they had no idea what the problem could be. And I sent it away for replacement through short-circuit.
Third was an M2-ATX HV replaced under warranty. Still, the cost of shipping it back was nearly the cost of a new power supply... Which was not covered under the warranty. (From Canada to USA)

. This power supply is still running however.*Crosses fingers*
Needless to say. If I go through another M2-ATX, it will be the last. Already their product is walking a fine line with me... And I've only been in the hobby for about 3 years, with a running carputer for about 1 year...