Check out this recent discussion on Cyclingtips.com with Enduro Bearings, Praxis and Chris King about T47, where it came from, where it is now, where it potentially can be, as well as other issues and ideas surrounding it. http://cyclingtips.com/2016/10/cyclingtips-podcast-episode-15-on-creaky-press-fit-bottom-brackets-and-the-promise-of-t47/