Portable Mini Plastic Bike Bicycle Pump Schrader/Presta Valve

Pros: cheap
does waht it says on the box
light (nice alternate emergency pump_)
has a valve clamp to avoid loss of pressure while you pump

Cons: -build quality poor (still functions decently)
-light plastic casing simple compression
-the mount that comes with it maust be atttached to -a water bottle mount on your frame

Other: it works as a good alternate emergency pump.
i don't feel it's going to last long

Pros: - Sturdy plastic material (for the pump)
- Does not escape air while pumping
- Practical
- Fits very firmly screwed to the water bottle suppor
- Proven able to pump at least up to 55psi with about 6 pumps per psi on a 26"x2.125 tire (6 pumps per psi when about 50psi)
- Head turns a little to aid avoiding to cut the valve
- Does not let air escape

Cons: - The plastic screws that come with the product are unusable; just get longer metal screws if you need, never rely to the plastic ones
- The pump support, in plastic -WILL- break if you let your bike down and it hits the ground by the support
- The pin in the pump sometimes move a little left or right, so keep an eye to maintain its position before you fill a tire.

Other: They are perfect for me. I don't think on buying new ones since I bought it. All tire repairs now count with the air from this pump; with the aid of a tire pressure gauge I can take te tire to 40-50psi.
Of course you can get such pressures much easier if you pump about 20psi and get to a gas station to fill with that car compressor to your desired pressure.