I did, (245/40/18 - stock size for 08 sti) have been out the track since i got them but on the road they are far quieter and offer way better grip than the factory dunlop sp600's. I got mine for $240 each....they want over 500 to replace the dunlops.

they have been selling like hotcakes here on the east coast, almost everyone i know that has bought a set of tyres lately has bought these, and the track guys i know have bought a few sets each. Some are claiming its as grippy as a toyo 888 or the old v70 kumho track tyre.