Okay so I already have my new Xperia Arc!
Let's start with the fact that I have mixed feelings about the phone itself. The screen is big but the Reality Display is VERY overrated. It's great when looking at it from a fixed position (perhaps Super Amoled-ish good at some aspects like colors, and it feels sharper) but the viewing angles are terrible. Just tilt the phone by a few degrees off and everything starts sucking. If you stare at it from a wider angle you will see greyish-crap that will make you cry inside that you've just paid almost 500$ for that. Probably even an Iphone 3g screen comparison would make Sony go home crying in this field. Bravia Engine? Seriously? First use a reasonable LCD panel, Sony. To sum it up the screen feels like they achieved miracles.. with a 10 year old LCD. imho beats Iphone 4's display when looking directly though. So very mixed feelings here.
The camera is awesome, on par with average modern point and shoot devices but images aren't as sharp as on Xperia X10. The colors, noise levels, contrast, low-light shots etc are amazing for a phone though.
The phone is slim and really very lightweight - I was wondering if it had a battery inserted the first time I had it in my hand and it's the only =>4 inch phone that lies really great in my below average-sized hand.. but it feels plasticky and is a fingerprint magnet. At least the dark version.
The CPU and GPU aren't lacking anything. Everything is smooth, no lags or slowdowns whatsoever and I'm yet to see a moment that would make me want more processing power (minus poorly optimized apps like Timescape). Actually it has a power reserve since it almost never clocks at 1ghz. The UI is good, no need to download custom launchers since the Sony one seems to work best. Smooth, intuitive and with nice but simple animations. Perhaps too much blue, but I can live with that.
See, I just think that overall reviews of the phone were TOO positive and they confused me a bit. The phone is good but I wouldn't rate it as great as most of the reviews that I've seen in some aspects. I'm pretty sure that heavy marketing helped with all those display test videos etc. That's why I was disappointed about some things, especially the screen and build quality since while it indeed looks well for the price I wouldn't say so about overall feel of its quality. It's not bad, it's just average.
Another suprise for me is that.. Samsung creates overall better phones, if not the best at the moment. Despite the fact that I own a Sony's widely-praised flagship now. There are a lot of Sony/HTC fanboys sticking to these brands, thinking that their quality is better, still regarding Samsung as one of those inferior phone manufacturers but it's simply not true anymore. The roles seem to have changed. Coming from an older and much cheaper Samsung it felt like I was downgrading with a lot of aspects - especially the screen, battery life and overall build quality which was very surprising to me. Arc's build quality resembles the first Galaxy S but I think that even the Galaxy S was a tad more solid. Plus it had a Gorilla Glass screen which is awesome, and it's a change that made me miss my Samsung again.
Now if Arc had an AMOLED screen (or at least IPS LCD) plus a gorilla glass screen and an aluminium frame..well that would be close to perfect.
Don't get me wrong, I'm really enjoying the Arc and I do recommend the phone but I think that I expected a bit more in some areas. From Sony and their flagship that they were so confident in. Certainly amazing reviews didn't help.
Oh, I have to say it - I was really surprised about how Android evolved over the few months that I was missing it. Maps were finally updated here with Navigation and it's so fun it made me love the phone again, despite my initial discontent with Arc's viewing angles. I've never seen Android running that smooth and fancy, and apps being so much cooler than when I last tried. I was impressed.