I haven't. I have a Cruzr XC though and first thing I did was put a 1.5 inch (I think, better measure first) rated Cobra buckle with dual adjusts on it and then put Suncor stainless triglides (that are way stronger than what comes on it) on both tag ends. I also changed out the bridge. I would have changed the leg buckles, but it was going to be too tedious.
The webbing and stitching of the Cruzr XC are great, and not what I would reinforce. The rest of the saddle is kind of cheap (belt webbing is too thin, all buckles are crap, bridge is barely passable for me).
Those buckles are knockoffs from either ebay or alibaba and the ratings on them are not legitimate and are just something the Chinese company that makes them put on them to look legit.
Woods Hunting Saddles makes an amsteel replacement bridge that is better. Or you can make one with rope on your own, it's not that hard.