Heres my thoughts on the One after 2 days of use.
1. I love the metal case. I guess Im just tired of the plain black plasitc cases that every cell phone has. I put a very thin clear case on it (a Speck case if anyone cares) and it doesnt take away from the beauty of the phone, and gives it protection should I accidentally drop it. As a side note...up until last year I never had cases. But, no one ever drops a phone before their first time, right? I accidentally dropped my S2 and it landed face down, shattering the entire glass. After I paid the deductable, I got a case. Not gonna risk it with the One. Overall the build quality is super. Best of any phone Ive had.
2. I actually dont mind Sense 5. Compared to touch wiz, it feels to me much less intrusive. There are a few features of TW I miss, but I'll adapt. Sense 5 is very quick and no lag whatsoever.
3. I dont mind blingfeed. I used Flipboard on my S2, so its OK for me. I set up my phone with 4 panels, with blingfeed on the first panel. I set up the rest of the panels similarly to how I had my S2 set up.
4. At first, the lack of the toggle panel on the pull down screen was a little disturbing, as I use a few of them regularly. However, the one has a widget with all the toggles I need, so just put it on a panel for fast access. Theres no loss of time doing it this way. With TW, you swipe down, then touch the toggle you want. With Sense, you swipe to the panel with the widget, and touch it. One you swipe down, one you swipe sideways. Not a big deal.
5. The screen is absolutely amazing. Enough said.
6. The remote capabilities on the One is incredible. It's almost like having a Harmony in my phone. Everything is customizable, and you can set up many different profiles depending on what hardware you've got where. For example, downstairs I have my TV, sat box, and receiver set up. In my office I have my TV and sat box. Very customizable. The only thing it doesn't do that the Harmony does is one touch on and off. Oh, and it will learn from the native remote if needed.
7. It did heat up a bit while putting it through the paces. But its to be expected. Doesn't bother me at all.
8. The One definitely has less bloatware installed than Ive seen on any phone Ive ever had. Its minimal. And you can disable whatever you want and choose not to receive Play Store notifications as well, as well as hide it in the app drawer. Space isnt really an issue, so I dont see an advantage to removing it vs disabling it.
9. The speakers. Wow. Just wow. I played some flac music using Power Amp and for a phone it sounds simply amazing. Very rich and clear. And holy shit these things are loud. For my ringtones and notifications Ive got volume set at about 25%. Anything more and its just too loud. I also love the speakers on the front for speakerphone, which I use alot. Friends have told me its barely noticeable when using it.
All in all Im very happy I went this route.
edit: Also, about screen size. I specifically like this phone because it DOESNT have a huge screen. I carry my phone in my pocket, and anything bigger would be too big. If I wanted a big screen I would've gotten the Note 2.