Really nice. Impressive efficiency, which is great....but at what point does efficiency turn from a worthwhile aspect of the design into stats willy waving? As an example, I never carry more than 6 pots, I like using a 68 tank for the length and always fill between games, so in theory I wouldn't see any tangible benefit from a marker that can shoot 20+ pots from a fill. As a technical achievement it's great, but I wouldn't let it dissuade me from buying a less efficient marker from another company.