MTX amps are just fine. Sure there are much more expensive options, but, the returns are minimal. If you need that extra 5% then fine. Spend 100's, perhaps 1000's more. If not, be happy with your purchase.
I ran a few 4 years ago and had no reason to exchange/sell beyond the fact I was bored.
BTW: Their repair service is top notch (new board for a reasonable price) and technical customer support is good as well.
Ge0