simple answer - I like the AC10 a lot. It fits it's purpose. Small and light weight valve amp with great Vox tone. Only reason I flipped the AC15 is because it is insanely heavy for a 15w amp. Was about the same weight as a Fender Blues Deluxe I had at 40w (which was more volume than I ever needed, literally knock stuff off the walls loud). Loved the tone and features, but lugging it around was a bitch. Ignoring the weight - the AC15 is nicer in all aspects. Real spring reverb (usable digital on the AC10), great tremelo, so much more head room, better eq options, and it can be set cleaner and then dirtier than the AC10. It's a "real amp" vs. a jam box. All that said, the AC10 is a great little amp. Real deal vox tone in a grab and go format without sounding boxy. I dont think I will ever git rid of it (and I flip a lot of gear) simply because the tone/convenience factor is so good.