I have one of these for each of the bikes I ride regularly (so I don't forget it).
Along with tire irons, patch kit and pump (and, cell phone) this tool completes my breakdown kit. And, you can be a hero to someone less prepared. )
If I were to buy another one, I'd get one with more options. This didn't have the allen key to tighten the water cage. It had to happen when I needed it the most. I have another multi-tool with more options and prefer that one. I suggest to purchase one with more options.