I've got the Crank Bros 19. The allen keys and screw drivers on it work well for occasional repairs. The chain tool on it sucks, but it has gotten me out of the woods on several occasions. Thats probably all you can ask of any multitool. I've also used the Topeak Hummer, and I don't like it as much as the Crank Bros tool because it's too complicated. I've heard the Alien is a good tool. I second the idea of getting a shop grade chain tool; once you've used a good one, it's hard to go back to relying on a multi-tool chain tool.