I dug my Matech out today to try it again. Darn if I didn't break the hex screw that clamps it on the rail!

Did a little googling and that screw is the weak point of the sight. I'm going to look for a similar screw at the hardware stores tomorrow. 'Course we all know how that always works out.
Looking at it again, I don't know why I didn't use this sight more. It really has a lot going for it, very light and the sight itself is strong. You just have to watch out for the clamping screw. I like the 25-600 meter ranging, not that I'd ever need it but I like it! Another nice thing is even with the sight up it doesn't block your field of view as much as just about ANY other BUIS out there. And the weight is only 3.4 oz, lighter than just about anything but the MBUS.