2009 WRX @35000 Miles. Stage1 from 100 miles till 29000miles. Stage2 from 29000 miles on. I had an issue at 26000 miles with my 3rd gear selector fork. Dealer concluded it to be bent. Dealer replaced it for free and during the process I got to see the internals of the tranny. Syncros and gears looked pristine.
I currently have a large TMIC on a stage2 tune and the car feels like it puts down a fair amount of power. I try my best not to get on the throttle until fully engaged in gear. I never mash thru gears. Especially shifting from 1st to 2nd under full acceleration, I'll take my time with the engagement. Other tranny modification currently on the car: Perrin Shifter Bushing, Perrin Adjustable Short Shifter (set in the shortest possible throw setting), Group N Transmission Mount, Whiteline Positive Shift Kit Crossmember Bushings, Torque Solutions Pitch Stop Mount.
I'm well aware of the risk braking the transmission so I know my limits. I dont have some crazy unreasonable expectations form the stock 5mt. When I purchased the car, I knew damn for sure that It aint no STI 6MT.
So far no complaints what so ever. Another thing to note is, at 30000 miles, I checked my tranny oil level, and it was low by a tad bit. I topped it off with Penzoil Syncromesh. Immediately after adding the syncromesh I was able to feel a definite difference. I can feel the syncros lining up the next gear quicker by a good amount. It has made shifting during aggressive driving feel a bit safer. Most definitely feels a lot less notchy. I honestly had no idea that the Syncromesh would make that big of a difference. Was in quite a shock when I took the first ride after adding it.