I see lots of folks upgrading from an S0. That's a solid 4 years of use. Batteries, cases, screens, speed... how did it all hold up? From what I understand, resale tanks after the next series is announced, so you either keep them for 1 year or you're in it for the long haul. If that's the case, there's maybe good reason to go for a more durable stainless/sapphire versus an aluminum. Thoughts?