Whatever happened to Dave Gore?
I used to work for Quatre.
The Gain Cell amp we made had terrific bass - and was highly regard in it's day. I wouldn't call it rough. In a showdown (Audio Critic) against Audio Research, Threshold, GAS and quite a few others - it came out as the winner. More liquid-sounding than the GAS.
It is still a pretty good amp. Still has great bass. And yes, it did have stability problems. Had a proclivity for going into DC offset and lunching a woofer.