I have only used it with electric, so can't help on that front. However, you should know that while it has a line out, it is just the clean signal - none of the tone shaping of the amp (EQ, nanotube) is included in that signal. Not sure what you meant by connecting it to the PA, but if you were hoping the sound of the combo would be included, I believe the answer is no.
My favorite part - it's so light! Can easily carry with one hand. It is made of plastic. I don't think it's loud enough to use with a loud drummer, but it's great for playing with other acoustic instruments and would probably work with a sensitive jazz drummer.
Here's a thread (in the bass guitar section) from when people first started getting them, might be worth perusing:
New Amp Day - VOX VX50BA
I guess my question would be - what do you hope to get out of this amp that you can't get from something else? To me this amp offers super light weight, pretty big sound for the size & weight, and the distortion. I don't use it for the distortion, it wins for me for the light weight, but only using it to play informally with other people, not in a band situation.