Ive been running this spring for 1 year solid with only one problem. It stripped out the rear trigger screw hole that attaches the trigger to the bolt reciever. Running with a zero trigger and orange piston, accuracy actually increased, contrary to what I thought would happen. I have no problem with the pull, however it does require quite a bit of getting used to. I'm running the stock cylinder as well.
Relatively easy to pull back
Teflon Cylendar not required
Need a new bucking
Striped out an important screw hole after about a year's use.