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How does the mex work compared to other options Richard?
If by "other options" you mean options for so-called "Mexican Carry" (unholstered in the waistband), there is the Clipdraw. However, that device leaves the trigger exposed and I therefore do not recommend it for routine use. I have a Clipdraw for my Colt 1991A1. It is mounted by inserting it beneath the right-side grip panel. I use it primarily for enhancing retention when carrying the pistol in a Galco Yaqui Paddle holster, as shown in the attached photograph. The Man Gear Mercury protrudes into the space between the Clipdraw and the pistol. Using the Clipdraw and the Mercury together would require opening the tension of the Clipdraw device, something I would not recommend.
(http://i2.photobucket.com/albums/y30/RichardS/apr2304.jpg)