I've been using Fender AmpCans for years. While I've had to have a couple of them repaired (one under warranty), and they don't have great bass sound, I find them quite adequate for many of the gigs I do.   I particularly like that they have a built-in rechargeable battery; no need to keep replacing a bunch of D-cells, etc.

I recently bought an Alesis Transactive Mobile PA System. It' pretty heavy, but it's on wheels with a handle like those common roller suitcases, so it's easy to move about.   It has a plug-in spot for an iPod, and it can take 2 mics (1/4-in. jack) or 1 mic (with a 3-prong jack or 1/4-in.) and one direct-in line from a guitar pick up.   It's more powerful than the Amp Can, and it can be run on its own internal rechargeable batteries or on AC via the cord and plug that come with it.    It has better sound than the Amp Can too, but no reverb.