I have no direct experience with the JT(I haven't shot one), but the first one I saw was leaking air out of the barrel. While I seriously doubt this would happen with all of them, I would stick with a marker that has been around for awhile(Piranha/Inferno/Spyder) for your first marker. Also, like Killeronion(who replies to alot of these threads), I HIGHLY recommend that you do not buy one until you have shot all of the markers you are thinking about.