Have not tried the Khan, but EVERYTHING that I have read says it is an improvement. The people on the Linn forum love it. Is it worth $1200, only you can answer that question.
LP12 owners: Anyone try the Tiger-Paw Khan yet?
I just found about this today and think it would make a marked improvement over the OEM top plate. I wonder if it would if it wouldn't actually add more improvement than a Keel. In case you haven't seen it check it out at tiger-paw.com, my local dealer says it is $1200 plus installation.