I'm just curious how many people consider iMessage a major feature of iOS and how many consider it negligible compared to standard SMS or other mobile chat applications. For me, it's truly been a game changer and one of the reasons that every time I try an Android device, I'm always pulled back to iOS. The fact that most of my colleagues and friends use iPhones means we could easily contact each other even when traveling internationally, allows for group chats, delivered/read receipts, and allows us to lower or even ditch our SMS plan. I didn't think iMessage would be AS significant to me as it has become. It's similar to when everyone had blackberries and used BBM and I'm glad that iOS now has its own built in mobile chat platform.