This is such a classic argument, too. I remember back in the old school days when some guys didn't want to use Soundstream Reference due the unregulated power supplies. But wow did those sound great on music and look at the "garbage" dynamic numbers they make. Not so impressive numbers for the sustained power output, actually a little below. The old Orion stuff was the same way, lower than expected for RMS but real nice dynamic burst numbers.
Again, this comes down to application. On this SPL forum, not many will be interested in dynamic performance but that has a direct impact on music. Tones, not so much. You need the tightly regulated power supplies for that. Of course, the bigger picture is how reliable any of these amps will be in their respective applications. Pick the type you need and feed it the proper voltage/current for the long haul. Beyond that, it comes down to responsible usage. Even an Audiopipe should last if all of this is taken into consideration. Okay...maybe not. But you see whumsayin'.