I have a Kstein plus loaded with KT88's and it is just killer sounding,great cleans too.....sounds like a modern marshall should to me....very crisp and articulate,not the buzzsaw distortion like a lot of these modern high gainers....I have to admit that I didn't carefor them based on what I heard but once I got one and figured it out I cant find an amp that beats it live and Ive owned a ton of them in the last few years.I saw the Stiff amps and just bought a FIstpump last night,so Im curious to see how it compares...Ive owned the rev,revplus and chadwick and liked them all.....Im actually going to get another chadwick at some point,regret selling it.....glad to see there are some that actually like them...lol...most I see post hate them....they are hard to dial in,but once you get to know them they sound so room filling....almost has a CD like sound quality,but still a very "organic" tone....