I cant recommend the Genz-Benz GBE-600 enough. More so then any piece of gear Ive ever owned. Its by far the most versatile thing Ive ever laid my hands on. The tube preamp is warm and tubey, and sounds better and better the more you overdrive it. The second FET preamp has a typical solid state tone, which by itself is not my preference. But, mix a subtle amount of FET preamp with some pissed off overdriven tube-goodness and WOW! Nasty warm tube overdrive with punch and clarity. You can get both ends of the spectrum with this thing. I have to think it has a setting to please anyone. The 5-band preamp lets me tweak the tone at all the right spots. Great sounding low mids. Its a LOUD 400W (at 4 ohms). Handles 600W at 2 ohms. I cant see how anyone could be dissatisfied with this thing. Its earned a number one spot on my cabs over many other expensive heads. Anyone else have comments on these?