To be honest, it's been a great experience so far! Always thought the iPhone experience would be limiting but hey, everything works just the way it should! Apps are a lot more stable too!
The iPhone 4 is a 2010 model and we're in 2015 now but I think it's still right up there with the best in terms of performance. Sure, the camera isn't the greatest when it comes to taking stills but that's a minor issue.
All in all, I think I'm probably going to be sticking to iPhones from now on.