"Best in class IMO"
This is rated at 600 w/channel @4-ohms/channel. While I have not had any necessity to crank it that high, I have run it into 8-ohms/channel [through 2 Peavey PR-12 speakers] in a small church setting without having to overdrive it--this was running a guitar, a keyboard, 3 vocal mics and electronic drums (2 channels) into it.
The sound is excellent.
The most useful features are: (1) The power amp option which allows you to run it as either a stereo power amp or to use one power amp to drive mains and one to drive monitors. (2) The dual 9-band EQ (one for each power amp). (3) The "auto-tune" feature which automatically adjusts the EQ for the room. When coupled with Peavey's "Feedback Ferret" circuitry, which isolates feedback before it occurs, this is an unbeatable combination. It is my understanding that no make of powered mixers offers this level of convenience in operation. (4) L/R recording out jacks.
Ease of Use:
This is very easy to use, even for someone with little experience in FOH engineering. Set it up, turn it on, wait for EQ auto-tune to finish, check for gain and level settings and you are ready to go. It doesn't get much easier than that.
This is solidly built--a metal chassis/body. I've been using Peavey PAs for over 35 years and they have never disappointed me. I've never had one break down on me in a gig yet.
I've only had to deal with Peavey customer service once and that was over 35 years ago when a plastic nameplate broke on one of my speaker cabs. Even though it was not a warranty issue, Peavey not only sent me a replacement nameplate, they sent a couple of extras "just in case"--all free of charge.
The only comparable mixers which cost less than this are not built as solidly and lack certain features which make this indispensable (auto EQ, for example) and are from brands I do not trust. Mixers of comparable quality from other manufacturers cost more, so this is well worth the price paid.
The Wow Factor:
Given the features this has, the fact that it is a desktop mixer instead of a "shoebox" mixer, and has aesthetic appeal (different colored knobs for different functions such as channel EQ, monitor sends, channel faders, master faders. This not only sounds good, but has more visual appeal than other desktop powered mixers.
Given my age and how well built this thing is, I don't anticipate having to replace it in my lifetime. If it does wear out, that's when it'll be time for me to hang up my FOH engineering cap and retire to just songwriting and performing.