i cant knock the operation of the marker, incredibly efficient and close fps groupings, shoots unreal, and very quiet, can hear the ping from my guerilla tank more than the marker firing. apart from that my first shot over the chrono being -10-15fps down, and just about everytime ive air'd it up it sprung a leak from somewhere different, and last time out it developed a little issue with the eyes not registering a ball, or even firing with eyes off. another guy with one had exactly the same issue so they've both gone back to planet.