Mine is a cheap piece of crap I bought on eBay, but it has all sizes of metric allen wrenches and screwdriver bits and fits into the little pocket on my Lezyne seat bag.

I see little reason to spend over $10 on a tool that you only really have to use when you're away from home. I have a very nice set of Craftsman allen sockets at home and so given the choice, I'd use those, not my multi-tool, which is more of an emergency tool.