The active ones have a trim pot on the preamp so you can make it very loud if you like. Personally, I set it to about the same as the passive volume, the output of which is fine, by the way. That way, if the battery goes, you can flip to passive without having to quickly tweak your rig mid song. I have 2 of the Jack Custom, and they sound really good, quite organic, fretted and especially defretted.
Also, they don't go out of tune, and I have NEVER broken a string on one!
Only one thing to look out for - check the truss rod will bring the neck true and flat. One of mine is fine, the other stops with about 1mm of relief. Still plays fine though, and no fret buzz!
Jules