I had an AC4TV, which I loved, but sold eventually.
Just recently I wanted something like it, so picked up the AC4C1-BL and was very disappointed with it. I manly play jazz, and it was unusably bright, with no power, headroom or low end. There are some mods which I tried, but didn't help enough. I can't recommend it at all, unless you want a chimey Beatles type sound.
AC15 I haven't played, but it would have to be better.
In the end I grabbed a Blues Jnr III, did some simple mods, and am extremely happy with it.