I recently bought this Evo 7-9 clutch and lightened flywheel kit for 470 quid (bargain!) and had it fitted to my car by Nick Mann with his flywheel adapter plate and I have to say it's really good.
Actuating the clutch pedal is actually EASIER than a stock manual VR-4 clutch, and the clutch is much grippier once you let it out, great for TLGPs
It helps with performance by just a small fraction, but the downside of the lightened flywheel is you have to rev the engine up just a little bit more to pull away at a junction or it'll (nearly) stall.