Chris S wrote a review of Crank Brothers Alloy Power Pump w/ Gauge on March 23, 2014
Familiarity: I've used it once or twice and have initial impressions
Bought this pump to carry with me on my road bike as an upgrade to my previous Wal-mart pump and an alternative to a CO2 cartridge, where if you run out in the middle of nowhere then you're in trouble. While the Crank Brothers pump does come with a frame mount, I like to stick mine in my back jersey pocket. It fits okay. On the plus side, the pump feels very solid and well made.
The problem is when I actually needed it. Got a simple flat on my front tire. I turned the head unit to the appropriate spot and connected the pump to the stem. After pumping like crazy, I could get to maybe 60 psi (and sometimes the tire would inexplicably lose pressure and I would have to start over at 20 psi or worse). I could never be sure that the stem was securely attached to the nozzle. Neither did I notice any difference using either max pressure or max volume settings. After exhaustion from all that pumping sets in, and mounting frustration, I needed to brace the pump against the ground to keep going. Since the nozzle is attached to the pump unit itself, you can only do this very awkwardly. And it's not a good idea for another reason: The valve stem isn't designed to be abused like this and so it snapped right at the rim opening. So not only did the pump not work at all for me, it ruined a tube and forced me to have to call in a rescue from an hour away while standing on a roadside getting hammered by frigid wind. Lesson learned.
If you're on a road bike, get a pump with a flexible nozzle. And make sure it works before taking it out on the road.