its also a matter of whether or not whoever is shooting the pneumag can walk a trigger correctly...you can have a perfectly tuned pneumag that is being used by some one who cant walk a trigger and cause it to chuff..yet they will blame it on the set up? some are lighter than others, some use a RT on/off, some use a ULT, some use a X-valve, some use a classic valve, some people dont test their lpr's to properly tune their pneumag
so its hard to go off of wat is seen or heard on tha net...you gotta either build or buy one and find out for your self...pretty much just like any other paintball product..ya know?