I just picked up the fork mount bike tray for the factory rack. I haven't mounted it yet, but it appears of very high quality. Essentially it is the Thule V2 rack with MINI specific mounting hardware, including locks. It costs $125 which is no more than the thule or yakima version. I will post pics this week. I initally only ordered one because I was unsure of how it looked (no pic in accessory catalog), performed, etc.. I have already ordered a second. According to the instructions the only potential problem would be with rear spoiler clearance when the boot hatch is fully open. I am glad Mini did not skimp and the rack is as good as the aftermarket ones.
ps- I am not quite sure why some are concerned with holes being drilled- the sunroof requires two giant holes, and the rear spoiler I believe also requires holes, in addition to the hole for the mandantory third brake light (in the US).