I've got Optilocks on my 75 and have not had any issues. They don't have Torx head screws though. Of course it's only a 30-06, but with 180 grainers it's been fine. That said, I've also heard quite a few positive remarks about Talley's on Sakos.
Talleys set screws will mess up the top of the reciever scope base checkering. One way around that is using a lead bb and then putting the screw in. I think the Leupolds QD bases(that are a Sako Knockoff BTW see above link) and Conetrols are the only suitable alternatives to Optilocks. I have been so snakebit by Talley steel bases and rings lately on other rifles that I'll probably never use them again.