I'm planning on stage 2+, when I seen Andrews post when he got a set of these brakes and I decided to go for the brakes 1st as there was only 2 sets left when I rang Aks. This brake kit cost £1500 but Alex at aks tuning made 10 kits up himself that's how he could sell them at such a good price, I think I've read somewhere rrp would be £2k + to buy the parts to make a single kit up.
I've not tried them properly yet, but I plan on doing a trackday if I can get a day of work in November. Andrew has tried the kit properly he has been on a track day with the brake kit and I recall him said they are a big improvement over the standard brakes.
If your after a big brake kit keep an eye on the for sale section on the mk5golfgti forum for kits I've seen VWR kits on there and ttrs kits for sale recently.