i had a galco m7x matrix for the 9mm frame sized glocks. i wore it like 2 times then sold it on the EE. i liked The wilderness tactical zipslide much better. only available for glocks, 92's and 1911's though IIRC.
the matrix was fine retention wise (both on the belt and the gun), but it was very thick and had no flexibility when i was working with it on. for a simple range holster it is more then adaquate and excels in that position. anything more and its flaws become very apparant.