Better than Most
I own a Pocket Shock DXG Fork & Shock Pump because it was evaluated as being very accurate (Google: Shock Pump Shootout). I bought one to keep my shocks correctly pressurized after the initial setup by my LBS. Now that I have one, the review was right, this is a precision tool. It has a valving system that once you fill your shock with air, it allows you to screw the valve off of the shock without losing air. On some forums, there were complaints that the pump lost air...but it could have been user error or a Monday pump. I would have given the pump 5 stars, but Topeak did not include a case for the pump--Wouldn't Topeak think a precision instrument like this calls for one? The case for the DXG will cost you almost as much as the pump!