I have that ratchet tool too and it's a neat concept but it's difficult to apply leverage without the bit slipping down from the ratchet. I do like the torx bits on it, though.

I still ride with my Crank Bros mini multi tool because it's got a chain breaker.

I like the simplicity of just carrying some hex keys but I've got 2.5mm bolts on the saddle light mount all the way to a 10mm for my cranks (both of which have loosened during rides previously) so that means I'd be carrying the whole set.