I mean, it's not amazing. I'm happy I have it, it does its job when the kids are in bed and I want to play and hear more than a twang.
The sound isn't bad, a bit rough/sketchy.
Build quality is ok, but loses connection now and then so have to wiggle it a bit and it comes back.
Battery's not bad for such a small thing, lasts a couple of evenings.
In summary, definitely better than nothing to spice up the weak twang of an unplugged electric in the evening, but don't expect it to blow you away.