Check out evolutionm.net and look at the tech section. Sounds like the tranny is plenty strong... I count 5 people claiming tranny problems, at least two are getting new tranny's or parts from mitsubishi, and guess what, they weren't even done with the break in yet. I'd be afraid of a tranny that fails during normal city driving.
And they said the WRX had a glass tranny? That makes the Evo's what?