I used the 90 gram co2 and was pretty impressed. I liked that the adapter allowed me to move the cartridge from gun to gun without losing any gas. The cartridges are pretty long, but not unusable in the vertical position. They are almost the same length as the 13ci tanks. I played all day and still had lots of CO2 left. Unfortunately, they don't store well once punctured in the adapter. The next day, the cartridge was empty. I will definitely be using these again!