I have a 50, it's a great amp with a rich full tone. Plenty loud if you want it to be. We had a 100 in my son's band. More money, weight and we really never needed the extra punch. 

It's been a while since I hooked my looper into it, but I am pretty sure I was able to get the benefits of both the looper and an effects pedal without requiring an FX loop. If interested in the 50 let me know and I can try it again to be sure.