WRX trannies have had some issues but not for the last several years,they've been pretty stout. I'm in a car club with quite a few Subis and haven't seen these tranny issues except for the guy who pushed on into the 11s and he had a few problems.
'12 Focus Red Candy SE Sport 5 spd
'99 Toyota 4Runner Sport
'11 Subaru WRX STI Hatch