Things I liked:Ease of loading/removing the CO2 container, whether the 82 ounce or the double stacked two 12 ounce caplets in the Umerex adapter, this is a fast air gun to service; compared to my precharged air gun, the effort is minimal, although at a cost of reduced power. Accuracy is exceptional and the gun is lighter than comparable spring loaded air guns. Things I would have changed:Some means of keeping track of remaining pressure in the CO2 source, say a "low" pressure indicator when the CO2 source drops below optimal. What others should know:Don't rely on pricing in the Pyramyd brochure, as I paid $37 more than the advertised price.
Things I liked:Saves money by using cheaper CO2 caplets without sacrificing the power level of this air gun. You may need to load more frequently, than if using the 82 ounce CO2 container, but this adapter is very user friendly and takes very little time to replace your CO2 power source. Things I would have changed:None. What others should know:Be sure to use the proper air gun chamber oil to lubricate the business end of the adapter every 3 or 4 loadings; keeps the insertion and removal rotations from tearing the gas sealing "O" rings.