I got a DD RBX, it wasnt the best finish i have seen, but definatly not the worst *cough* amd stock hs *cough* i lapped with with 400 first, and then 1200, 1200 wet+fairy, 1200+silicon oil, brasso wadding, brasso on kitchen towel, brasso on duster. its now almost as smooth as glass, except for a scratch just outside of where the cpu would touch, due to my brother throwing his school bag onto the table where i was working
1200 was the finist grit i could find in nw london, which sucks.
(ps. i like brasso.)