I can't understand why anyone would pick the S4 over a HTC one?
Ugly design mostly from me, most HTC's over the years have never appealed to me because of their design. I can see why some would love; it's different and a bit more unique, but just not for me.
Upgraded from GS2 to GS4 a few days ago. It's a great phone, although coming from the S2 it doesn't really feel new - some of gimmicks like air gesture/view are cool for 5 minutes, before they start to annoy you. Upgrade was required because software updates were ruining the S2, which seems all too common with smartphones - they roll out updated operating systems, and when they adapt them for older phones, they never seem to be completely functional and require a lot of effort from the end user to get them stable.
Samsung's customer support is woeful in my experience, they are piss poor when it comes to supporting older tech, and Kies is the worst piece of software ever invented, luckily AirDroid works so well.
I still seem to be having a problem with saving defaults, which was a problem on my S2 before too, anyone else have this problem? When I open a link from Tapatalk say, it'll ask me what to open it with, I'll choose Internet, and select always, but then when I carry out the same selection again it'll ask me what to open it with again, and it does this every time. Thankfully, coming from the S2 I've got used to Android's quirks, and couldn't imagine myself ever going back to iOS, love the flexibility Android - I can play GTA with a Wii mote or a PS3 remote without having to root my device, wonderful.