I plug into Ostap custom reborn model (50 W true valve amp, who doesn't know) through twin celestion vintage30 cab by Harley Benton. When I was lookin' for my amp, tried a lot of stuff the similar price worth and more expencive. Couldn't find something as good as my amp! As far as I know based on soldano SLO-100 schematics it's usefull for totaly all kind of music from clean-sound funk to jazz or blues, hard-rock(clean channel with crunch mode) to the very heaviest kind's of music (dirty channel). You can set a clean sound you need, putting there a different sets of russian (6N2P-EV and similar) or in whole world better known 12AX7, 12AT7, switch the cathod heating voltage between 6,3 or 12,6 volt mode, if you not happy with EQ (btw I doubt that too) - i'm sure, everyone will find his sound that way, whatever he needs. Dirty channel is usefull for all kind of overdriven sound situations, as I sad already, set a gain you need and play solo, modern hard-rock or heavy riffs, turn the gain using the volume pot on your guitar, or just picking different way or hardness - everything else is left for your own hand.dll - that's a faktor of the really good amp. You can have a dynamic you need in every mode. I like to play my unplugged el. guitar too. Plugged into the other amp I've tried, I feel like I loose my feeling of picking that way. Through my Ostap Custom I can practice unplugged guitar easily not carying about the dynamic, because it "hears" my guitar as I do practicing unplugged - never thought it's because of the amp until now. Few people, having the same amp said, it's not friendly to some overdrive/distortion pedals (don't really remember witch models), but I've never tried that, it's good for me as it is.
One more thing. Bought it, fooly hopin' to save my cheap guitar... This amp is to "fair" to do that. It shows all the bad sides of my guitar not hiding any of them... And now I need a new guitar...