Any of them. Tube, SS, matters not, I just can't get along with the boxy buzzy compressed sounds. I'd love to love them too because I really get the portability and all that. I've tried all the Roland line, Kustoms, Yamaha, Line 6, Fender Champions 20 and 40, Super Champ line, etc. I've got to have at least a 10" speaker but much prefer 12". That's not saying I like every amp with a bigger speaker but it sure helps IMO. I will say many of these small amps sounded substantially better through the headphone jack with decent headphones.