I bought recently some Park Tool "fold up" allen key and torx multi-tools and don't like them at all. Since the handle/body is plastic and there are moving parts the feel when using is very mushy. I like to tighten to what I know is a good amount and I can't do that with these sets. And they're combersome. I've not used them since buying them, much preferring my individual keys/drivers.

I have a set of very nice shiny small smooth Craftsman combination wrenches from the '70s, 4-12mm and I carry just the sizes that fit nuts/bolts on my bike. I just prefer individual everything for the feel and the precision.