I just had to post my experience using the Thermalright backplate with the Intel stock HSF. First, forget about trying to salvage the f@#$ing push pins. Just break the little black plastic holding arms, separate them and THROW THEM AWAY. I mounted the backplate,(yes I had to disassemble my motherboard and pull it out). However the stock HSF mounted wonderfully tight and my OCCT temps are 55C under load instead of 75C!! That's running my e6300 at 333FSB instead of the stock 266. No matter how well you think that Intel HSF is mounted, you are probably not making the correct contact. Twenty degrees is a MAJOR difference. If the stock HSF didn't have the push pins, it would probably be a good unit. I'm going to change over my 2 kids' computers. Worth the $20 for 3 sets and shipping!!! BTW, I also used electrical tape on the back of the mobo around the mounting holes just to insure that there will never be any contact with the metal solder joints.
Had to add this. If you are buying an aftermarket HSF, make damn sure that it doesn't have PUSH PINS!! IMO push pins defeat the whole reason - better cooling - to have an aftermarket HSF solution.