I own a PLX 3002 model, which i use in conjunction with a pair of yamaha S215IV speakers and it is the best sounding setup i have heard yet. I take my equipment on the road a lot, and the PLX really takes a beating without any damge to the unit.

Quality:
Very light. It would take two plx's to match the weight of one rmx.

Desirability:
Good for main cabinets. But don't forget about its fellow rmx friend too. Then you will truly get a fuller sound

Sound:
Do not kid yourself. This amp kicks butt. However, it is more of a amp made for your main cabinets. Because of the tight bass features with this amp (higher damping factor), the bass lags. The best thing to do, if you are a qsc fan like me, is to mix and match. I use the plx for my mains, and the rmx 5050 for all 4 of my subs. Remember, you do not need a real high damping factor for subs. Otherwise, your punch will always lag

Ease of Use:
Bass lags is all

Feature:
Has on-board limiters, which is great. Switchable low end rolloff, lots of options. Speakon connectors plus banana jacks, very versatile. No complaints in this department.

Quality:
Seems sturdy and reliable.

Value:
It's cheap, compared to say, a Crown K2 or Macrotech. Then again, it can't drive subs like those two excellent amps can. You get what you pay for.

Desirability:
I wanted it until I had it for a while. Now I'm less excited about it. I wanted to replace all my conventional power amps with these little lightweight amps that draw less from the wall. Didn't work out for me on the subs so I went with K2s, which are conventional power supply but pulse modulation output for high efficiency and much better sub sound.

Sound:
Better on mids/highs than subs, just doesn't measure up soundwise to a conventional power amp for lows. Sound is distinct, but thin. I A/B'd this amp to a Crown K2 and an old Peavey CS800. Both of those amps were much more punchy and full on the low end than the PLX, which is surprising in the case of the Peavey. I moved my PLX to the mid/highs and it sounds fine in that application.

Support:
Give it the benefit of the doubt, I haven't needed support but I hear QSC is good at that.

Overall:
I wouldn't buy another PLX amp, though the one I have is fine on subs. You CAN power subs with them, but you need to EQ them pretty heavily and that reduces your headroom unless you use several, which kinda defeats the low weight thing.

Pricey, but with a lot of features (compression, high pass filter, 4 pole Speakon connectors plus banana jacks, bridgeable) and very light (21 lb) for its power range. Only two rack spaces, quality construction. Biggest minus is lack of low end punch - I A/B'ed it with a Peavey CS-800 through JBL 18s - it lost. Typical for switching power supply amp vs huge, heavy transformer. Oh well, still good for mids, highs, and monitors.