Here's a link to their webpage:
Billet Products Australia - Home to the Billet Pro Series shifters
Basically... 35% throw reduction, standard shifter height, adjustable positive stops... all the usual features of their other products.
There is nothing said about a self centering spring pack to help out the 2nd to 3rd shift (major selling point for the billet T5 shifter), but I assume this is because the getrag box already has this function built in, so is not needed.
I guess no one has tried them out so i'll let youz know how it goes, for anyone interested