Taylorplayer,
All the tech info you can find in the link below. Also make sure to look at the Q&A section so you can see Mr. Zinky's origins in amp design.
http://www.zinky.com/
Also, do a search on the gear page (link below) and you will find other Zinky users (they know more about amps than I ever will) and their thoughts on the amp.
http://www.thegearpage.net/board/
Personally, my biggest reason for liking it is the fact that I can dial in ZZ Top, ACDC, and even higher gain stuff like Zakk Wylde and Metallica, etc. inside my bedroom. You will need a pedal for nu-metal Godsmack type tones.
I'm not very good at describing tones, etc. but I used it for an outdoor three song gig with a band not too long ago and I was very happy with the tones I got. We also did a Journey song and a Duran Duran song (I know, don't ask) that required cleaner tones with chorus and delay pedals and I was very happy with the Zinky's voice.
Let me know if you have other questions.