I have an OSP and a 5.25 with the Springer mount. Using a Holosun 507c for both. The Springer mount works excellent, especially since the updated versions use the cross pin from the rear sight to secure the plate to the slide along with the Allen screw. But just to be sure, I also "bedded" my mount with jb weld. It's not going anywhere now.
Both guns are a great choice. Me personally, I just like the 5.25 better.