I'm not a fan of mini-tools.

1. Mini tools will usually contain several items that you'll never use. Do you really think that you'll ever need a 2.5mm or 3mm allen wrench on the road?
2. Some are worse than others, but mini tools tend to be clunky. A simple job, like tightening a water bottle cage, may become a vocabulary expanding experience when you try to do it with a mini tool.
3. Allen wrenches don't last forever. Worn allen wrenches round out your allen head bolts. Now what are you going to do? Your 5mm allen wrench will probably wear out before you've had the opportunity to try half of the gizmo's on your expensive Alien.
4. When you need a chain tool, it would be kind of nice to have one that actually works.
5. If your crank arm comes loose, you'll need an 8mm allen wrench to tighten it. The torque spec for that part is 30 ft/lbs. That means that you have to press down with 120lbs of force on the end the 3" long allen wrench that's included in your mini tool (if it has an 8mm allen wrench).

When I worked in bike shops I loved mini tools because it was an easy sell at Christmas time. My family, even the ones who don't ride, know better than to buy me one of the stupid things.