According to the service records I have from the original owner, my SVX had a new tranny installed under warrenty at 15k miles. The rebuilt tranny lasted to about 180k miles... I purchased it with known issues.
I spent about $400 getting the tranny rebuilt so it drives almost 100% now (just a little bit of whine/binding when it's cold and I'm turning in tight circles). It will certainly last me till next spring/summer when I plan to put a 6-speed in my WRX, which will leave me a WRX 5-speed to go into the SVX.
Now, if I could just find a JDM non-DCCD STi 6-speed w/ track differentials for about $2000...