What's the deal with Com Cams?

I run factory lifters on hydraulic rollers. Last set I got was from PAW I think they were made by SIS or something like that and work fine. Then tend to be quieter and rev better than some of the aftermarket designs. With the hydraulic rollers pretty much any hydraulic roller lifter will work. It's not like the solids or flat tappets where the lifters sgould match the cam manufacturer.