I did some research on this before ordering a bunch of new mags after buying the SR1911 over a year ago. The Wilson's cost more and everybody loves them, they have to be better. Maybe not.
The Checkmate and Ruger frame are matched in their design to reliably feed cartridges with projectiles of different shapes, ball, HP's, SWC's, etc., without the need of further tuning of the feed ramp, slide lock or mag release. Other mags will work but not with the same reliability without further tweaking. An exception would be the Wilson's which by design present the cartridge at a different angle avoiding the feed ramp issues that vary from the frame designs of different 1911 manufacture. These are favored by shooters that want a universal mag for several different 1911 frames they own. The Checkmate's are the same as those that came OEM with my Colt and I've also seen them on the Springfield's. I bought 6@ $20 ea, free ship from 44mag.com. Zero mag feed failures w/10,000+ through the Ruger and 3000+ in the Colt.