I do. 225/45/17 on stock Spec C BBS 17x7.5 rims. They replaced a set of Bridgestone Playz PZ-1s.
Impressions:
Wet grip is good, but not great. I suspect a directional tire like a T1-R or an Eagle F1 will do better.
Dry grip is bloody fantastic, about as grippy as you can get without a semislick. Under track conditions using standard STi pads on Brembos, I couldn't get the ABS to trigger.
Ride quality is reasonably awful. They're definately loud. The ultra-stiff sidewalls mean you feel the road buzz a bit more, and bumps are sharper.
Steering feel is awesome. The sidewalls don't deflect much, so you get really good turn-in, and you get much better steering feel as well. Be prepared for your car to tramline a little bit.
Lifespan is short-ish. I've got 4mm left on mine and have done 9,000km on the set from new, no track work. The last set I had were used ones, with 4mm but bad camber wear on the two which I put on the back. A track day at Taupo balded the insides of the back tires.
Price is painful. Tony's in Wellington charged me $370 a rim fitted and balanced.
Overall, they're what you expect - a maximum attack track biased tire that's road legal. I heard rumour that they were being phased out for the RE11, but from what I can tell the RE070 is still fitted OEM for the current JDM Civic Type R, and runflat versions are OEM for the R35 GT-R.