I have a 27" late 2012 that I've had for exactly three years now and I'm getting concerned with the SSD wear out level. ArsTechnica review for the latest model- Apple tells us that the Fusion Drive algorithm for these new drives is less aggressive about moving things from HDD to SSD, as well, primarily to limit the amount of wear on the flash. Well, I think it's definitely too aggressive if it's already this low. I would have never known I had a problem if I didn't use this application. I took it the Apple store a few months ago when it was at 35% and the "genius" there did the standard triage of tests and everything passed and he basically said just ignore it, it'll be fine. Options- 1) Replace the SSD blade with OWC Aura Everyone says it's a pain to take these apart. Does anyone know what Apple would charge for labor to do the replacement? Do you think they would refuse to do it because it's not the factory part? 2) MaxUgrades Blade SSD Module with mSATA SSD Drive. Haven't really seen any reviews on this. 3) Use an external SSD in a USB3 enclosure as the main boot drive. Cons- No TRIM support and can't perform firmware upgrades. I haven't been able to find a reasonably priced thunderbolt enclosure. Any other ideas or recommendations?