I've had an iPhone 4s for about 10 months now without Jailbreaking and it's fine. My only problem is the battery life has significantly decreased from 3 days to a matter of hours. My Motorola Milestone was the same though, ended up only lasting 5 hours.

Anyway yeah, I now have iPhone, iPad and Macbook Air from Apple products and the integration is fantastic.

And to think I used to dislike Apple old me would be disappointed.