I HAD success...
I had a Marstar mount (red loctite) and a $100 Leapers scope on mine for a year and a half and it was great - the rifle shot 3/4" groups with handloads all day long and never wandered.
The whole time I was saving for an expensive scope and (after selling the Leapers scope) got a Zeiss 4.5-14x50 and some expensive quick detatch rings, and the nightmare started. Firstly I could not get the thing to zero as apparently my mount was not level (although the $100 Leapers scope liked it fine). This took two range trips to figure out. I had to dissasemble the mount (red loctite DOES come off fine with a heat gun and steady pressure unscrewing the screws), fill the factory screw hole with JB Weld, and re-drill it higher up so the mount could fit lower on the rifle. Then I reassembled everything and hit the range again. Sighted in fine and I thought I was all done. Hit the range again a month later and the rifle is shooting all over the place, and I couldn't get it adjusted. At home, I found my QD rings were finger tightened, but an allan key showed them to be not very tight at all. Tightened them, checked over the whole setup, and hit the range again the next day starting to get seriously annoyed at my previously awesome rifle. Damn thing still had bullets wandering all over the freakin place. By now it's been five trips to the range, at least 100 rounds of handloads wasted, serious frustration and still my rifle isn't zeroed. Not to mention over $1K in "upgrades"! Next step is to put another scope/rings combo on this rifle and see if that works. If it does, then my nice shiny Zeiss is going in for repairs. If it doesn't well, then it's the mount and I'm going to drill and tap the damn reciever (I've seen Beater mention doing it) and I'll avoid all the "M14 mounts" nightmare all together.
AND I was supposed to go kill my moose with this rifle next week before the Liberals make it restricted, but now I can't.
Why, oh, why did I not stick with my $100 Leapers? If it ain't broke don't fix it!