very, very nice.
perhaps 1 day I also send a 3570k down if I go nuts over overclocking!
have an oc 3570k chip at about 72 degs hottest core at 1.29v prime stable 2h(dota/sc2 stable >6h!), another non-oc 3570k which is around 50+ degs at load.
with delid prob can drop down 10 or more degs!
Yes, it can go down average 12 to 18 degrees.
Old chip is harder to delid, as you can see the pic the intel heatspreader clamping area already bent in due to its pressure from the LGa socket clamp.