One of the main reasons I went with this phone is advertised battery life, and I was pleasantly surprised to see that I only need to charge it once every two days, and even once every 4 days with light use.I like the Windows 8 interface - it''s intuitive and is aesthetically pleasing. A lot of the little details have been given enough attention: dialling, messaging, the browser don''t have any clear flaws. Overall, I think it''s about the same as an Android device (which I have used) or an iOS one, i.e. a good OS with no major flaws. I also like the HERE Maps app, though there is a Google Maps for Windows which one can download if absolutely needed (I have not needed it yet).There is one minor missing feature in the OS which I get to later in the review.The device itself is quick (in spite of the 500MB memory), though I have downloaded only about 15 apps in addition to the ones which the OS came bundled with. Given I am not likely to download too many more, I don''t see performance being an issue for me. The touch-screen is also very responsive, and the physical buttons for volume, the on/off and the camera are all useful. Also, the phone looks fantastic! It''s slim, sleek and I really like the sharp(ish) corners. It''s also rather light for a phone of its size. The music also sounds great on the phone, though not as good as on my Cowon MP3 player.One major complaint of Windows devices is the relative paucity of apps for the platform. I have not really found this to be a problem as nearly all the standard apps are available (Pandora, Kindle, Amazon, Weather etc.) and work very well. I don''t use apps for websites though, so my demand for apps is not that high. But even then, firms are also paying attention to the Windows OS now, so the shortage of apps may not last very long.The only little flaw I have found in the phone is OS-related: There is no way to enable an alert if you have an unread SMS or a missed call. On my old (non-smart) device, I could get the phone to beep and vibrate every few minutes if I have missed a call or text message, but on this device, I don''t realize this until I actually look at my phone. It''s a nice-to-have feature (not enough for me to drop the rating to 4 stars) and I hope Windows builds this into one their future releases.To summarize, I''ll say it''s a very good phone to buy. I look at it as an Android or iOS phone which looks great and has great battery life.EDIT: After nearly 4 months of use at this point, I stand by the good rating I gave earlier on but have to adjust my rating for these reasons:1. The touch-screen of this phone has begun to hang periodically, rendering it unusable. The buttons on the side for volume and power continue to work, so it''s only a problem with the touch-screen. Soft and hard resets don''t help.2. This phone is not covered by Nokia''s warranty in the United States. Hence, I will either have to pay to have the phone fixed or write-off the $290 I spent on it and get a new one.