NSW, Australia? If so, welcome to another Aussie ! Look us up under "Local Clubs" on the top toolbar of this site.
Mike Long makes a truly world class product. The next manual trans that I buy will be the GF5R 5 speed G Force trans. Mike spends quite a lot of money on R&D to make sure his products are right to go - even before he has released them to the public.
As far as I'm aware, no-one on ClubCobra or FFCobra have used a GF T5 kit yet. Some of the Mustang guys at
www.corral.net have purchased the internals, but I haven't noticed any feedback about them. Might be worth asking over there...