If small is beautiful, this is the most beautiful pump you'll see. It's only 160mm long, bless it, and at 65g is the lightest I've seen. There's a £29.99 dearer carbon version too, which claims to be ten grams lighter but isn't, and as such is of interest only if you really like the look of carbon. I put it to work inflating a 700x23c road tyre, and a mere 400 (that's not a typo) strokes later had a usable 90psi in the tyre, and a very sore palm. Topeak claim it can manage 160psi, but that's like claiming you can empty a bath with a teaspoon.
It's hard to see who'd want this pump. People that habitually carry a pump will have, or can buy, a better one, and those that fanatically watch the grams are better off with a CO2 inflator as a last resort. Given how many good, if slightly larger, pumps you can get for the same money, you can't help thinking the Micro Rocket is going to lose out.