This is a fabulous travel pump. I usually use CO2 when I'm riding around my home town, but I take two or three cycling trips a year and since you can't fly with CO2 and I can't count on getting any where I'm going, I use this every time I travel. It is surprisingly effective pumping up road tires to good pressure. In fact, it can easily pump the tire to considerably higher pressure than is optimal.
Since it's got a nice long hose and a little tab to put your foot on, it's easy to pump up the tire without worrying about damaging the value (which is a common problem with most frame mounted pumps).
And it's amazingly light. It's easy to through in your bag, and even if you're a weight weanie, you can easily carry this pump on your bike without feeling like you're lugging a lot of extra weight.
This works like a mini-floor pump so you won't wear out your arms pumping up a 4 tire. I was pleasantly surprised how well the on-bike mount worked. After 100 miles of gravel road the pump hadn't slipped down at all. The only negative is that I have to store the angle attachment in my seat bag because of the way everything screws together to stow the hose.