I ran a single Shield mag with my dept. issued 48 a week ago. Put a combo of 150 rounds of factory ball and Federal 147 through with no issues at all. Used the plastic mag catch as well, but didn't do a lot of dynamic mag changes.
Seated firmly and ejected easily, slide locked back each time it was empty. Example of one.
The 48 with a spot for mounting a light and the Shield mags would be my near perfect gun.