I also installed a set of Raceware studs earlier this year and was impressed as well. Just ordered 2 more sets. I don't think I will ever use the stock TTY bolts again. The stud kit is not cheap, about $300 USD, but installation is pretty simple, they are reusable, and most of all they seem to do a stellar job keeping the head sealed up -- not a small concern on these motors....
ARP also makes studs that are compatible with the D24 setup. Haven't tried those firsthand but they have an equally good quality reputation and may be slightly less expensive. On the other hand, Raceware is great in that they make a kit packaged specifically for the D24/T whereas ARP does not -- you have to buy their kit for a 4cyl VW diesel, which is short 4 sets of stud/nut/washer, then add the missing pieces a la carte. I'll keep buying Raceware stuff since I know I like their product but I am sure you can't go wrong either way.
