How you treat the car has a big impact on the car on longevity. I make over 350 whp with LGT gears (which are not a huge upgrade either) and haven't broken anything yet. However I'm not launching the car either. Keep in mind that it doesn't necessarily take a catastrophic event to break something; damage is accumulative. I've also busted 3rd gear without any heavy abuse on an '05 WRX gearset.