it drives my ksc75's without ant distortion at all, but i listen to it on 40/40 when in a noisy area and fell it's still a bit low. at work, i use about 15/40 as to not bother anyone else around me.
I've tried it with my RSA Tomahawk and the player sounds better without the amp.
Amping M6 also talked about here link
No, this was their last full featured player. They came out with something smaller with less features while this was still out. Everyone thought it was a stop-gap until they released an upgrade to the M6 but that never happened, instead they announced they were going to complete with Apples iphone and no longer focus on media players. They took awhile to bring out the first phone, but apparently they've been fairly successful, but now they just make decent Android phones in a world of decent Android phones instead of innovative media players, which they obviously had the talent for.
As far as how well it sold, I don't know, but it was very popular in the States at the time. Walgreen's drug store actually licensed it and sold it through their online store. There was certainly plenty of interest in a follow-up, but like I said, that never happened.