Similar the standard Power Pump design but with upgraded alloy body and gauge in a slightly larger package. The Dual piston mini-pump with high volume/high pressure switch produces enough air for high pressure or volume. Alloy body will hold up to abuse and provide no hassle function for many cycling seasons.
This is a great pump. I can easily get 100+ psi with this pump. "High Volume" setting to about 45-50psi and then use "High Pressure" setting for the rest of the way. Like all mini pumps still takes many strokes, but not as much as most since its fatter and its dual piston so the effective lengh is as long as when its extended and it has a gauge which is awsome. Not sure about the other reviews... it works perfectly for me... does take a little breaking-in period though as thing loosen up.
Negatives: its a little big for a mini pump but its much smaller than pumps that have the same performance, so it take the better performance for the slightly bigger size..- hard to find a reasonable place to put it on the frame but it fits in a pocket pretty easy
Great idea, but it doesnt work. I cannot get high pressure with this pump--aside from arm strength, the seal does not hold above 80psi (I pumped up to that with a floor pump, so I could try just one or two herculean strokes with the mini pump, and it just starts leaking at the stem seal). Also, the twist-lock mechanism that grips the stem is very likely to tear some skin off your knuckles. A lever lock would be much better.
Regardless of how I try I cannot get more than 65psi in my road tires with this mini pump. The high pressure setting is useless unless you are a power lifter. I have moved to using this pump only on my commuter and cross bikes where it operates just fine. Save your money and get a full frame pump if you are looking for your road bike.