So, I followed this thread with interest, having just done the VERY thing I thought I would never do. I got a 4S.
I am the WP7.5 evangelist. Love the OS, show it around, brag on it to others, who (until the have played with it) just don't get it. I mouthed off about how I would never use anything except Windows Phone...yet here I am, with an iPhone. And I like it.
I may like it because I had rather low expectations. Due to an emergency situation where I was phone-less for 18 hrs, I knew I needed a backup. Figured that backup should also be a GSM phone that travels EASILY across international borders and back (carrier unlocked, from the Apple Store); has a reliable signal and just works.
I swapped standard for micro-SIM to set it up with intent to use it for a few days, then return to Windows Phone for regular use. Man, was I surprised: after 4 days, I knew I would stick with the iPhone as my primary device.
Here's why:
**The display. Small, yes. Downright teeny, but so gorgeous. I've gone from Trophy (3.7) to Titan (4.7) to Focus S (4.3) to iPhone (3.5), and I am amazed to say that I am digging the iPhone.
**The ease. When people say it just works, it really does. I swapped it after a few days for a one with more memory, and it was ridiculously simple to restore backup from iCloud. Apps. Photo albums, Calendar items. scribbles in SimpleNote. Screen setup: wallpaper, icon arrangement, everything. As easy as it was on BB back in the day.
**Wi-fi connection. I have both devices in front of me, set to wi-fi. The Focus S drops wi-fi constantly: after phone goes to sleep... when it's awake and in the middle of doing something...I am forever re-connecting the wi-fi to do anything at all. In contrast, that darn iPhone grabs wi-fi the minute I get to work and holds on. All day. Awaken the phone from sleep, and wi-fi grabs again, so quickly that you'd think it never slept.
**Words With Friends. I am not an app-junkie, and the only games I use are WWF and solitaire. Got hooked on WWF on my pre-windows Android, and resorted to Words By Post on WP7. Getting WWF back was like finding water in the desert. It took getting it back to realize how much I had missed it (either that or I was in denial).
I like the build - it IS solid and beautiful. Solid stands out with Focus S in one hand and iPhone in the other. I also like the size. My eyes want a larger screen (and how), yet my girlish hands want to hold and use with one hand. For now at least, the eyes *don't* have it. The hands win.
I like the beauty of Metro, and would prefer that to mismatched icons, yet I do like having separate screens back: home, news, work, travel, AV and junk drawer.
I will keep Windows phone as a wi-fi (iI know, right? What did I JUST say?) and reading device (to let my eyes win out every so often). I am enjoying iOs and crow. With a side of fries.