Currently I only carry a mini-pump but do envy the quickness of CO2. However, I've helped at least three riders over the years, who blew through their CO2s for one reason or another, and needed a manual pump. Carrying both mini and CO2 would be ideal and I've seen one mini-pump/CO2 combo, but haven't heard much about it recently. I do like the idea of manually pumping to ensure proper bead seating, then finishing off with CO2. My friend expended one CO2 and almost one tube when the tube snuck out of the tube (yes, he did accept my offer for my mini).

Regarding "pumps up to xxx psi" package claims, that is only half the story. A more complete statement is, "pumps to xxx psi with xxx lbs of force", and that "pounds of force" is what the user puts into the handle. I am not sure what the "average" person can exert on a bicycle pump, since the exerted force depends on ergonomics. I have a mini (Bontrager) with t-handle, and it is easier to use than a straight handle.

I always find it easier on the pull stroke than the push stroke, anyone else? If so, I wish you could flip a switch to pump during the pull stroke, especially towards the end, when my hand is shaking as I try to reach what I consider "acceptable" and I am both fatigued from 100+ strokes and muscle tired from the resistance force.