My experience with CheckMate & my CCO were mixed. One of the OEM mags was OK, the other was nearly unusable. Though there was some improvement with use.
I also had a used (I mention "used" because I'm not entirely certain they are OEM.) PM7 40 that came with Metalforms. They sucked...period. I replaced them with MecGars because .40 S&W Wilsons were unavailable. They worked well.
Sadly, even with a premium product such as Dan Wesson, Mags are still the weakest link. Hunt down some Wilsons or Tripps and things should be fine.
NRA Life Member
"If you put the federal government in charge of the Sahara Desert, in 5 years there'd be a shortage of sand."