- Reception and call quality Reception on both 3G and WiFi has been solid, the phone detects networks quickly and easily and hangs on to them. Call quality is nothing special though.
- Display It doesn't have the pixel density of iPhone 4 nor of the latest top of the line Android phones but Clear Black moniker is apt & color reproduction very good.
- Battery life The most recent update, late Jan 2012 (v. 7.10.8107.79) has upgraded the battery life from decidedly average to best in class!
- Camera Performs very well in good lighting conditions, especially outdoors. Struggles a bit in low light. Occasional color fringing issues.
- Ease of use WP 7.5 is really a delight with almost no learning curve.
- Design and form factor I lusted after the Nokia N9 hardware but my head won the battle over my heart. Was gratified when they repurposed it for this. Best thing this side of iPhone.
- Portability (size / weight) It's thinner than the iPhone 4 but a little longer. Not as thin as the latest Android phones. I personally love the screen size. Heavy but in a good, solid way.
- Media support Zune trumps iTunes handily and has subscription based streaming services and on devices podcast subscriptions to boot. Kindle app takes care of books & mags.
- Durability Unibody polycarbonate construction plus Gorilla Glass screen promise longevity.
- Ecosystem (apps, accessories, etc.) Apps have some way to go but WP 7.5 bakes a lot of functionality into the OS. No device specific accessories to speak of & unlikely that there will be any.
WP 7.5 has changed that and with the great hardware of the Lumia 800 I've been happily using this as my primary phone for over a week now, having switched from an iPhone 4S.
The OS really is delightful, Microsoft has taken a fresh approach to it, very different from iOS and its clone, Android. There is a ton of functionality baked it, obviating the need for a lot of apps but there are still some key ones missing: Skype prominent among them (though we can assume that since acquiring it Microsoft has something exciting in the works).
I vastly prefer the on device media handling of Zune to the iTunes equivalent on the iPhone.
Other than the point about apps noted above the only other area where the iPhone 4S has a distinct edge is with the camera: outdoors and indoors with good lighting conditions the Lumia 800 is very competitive producing sharp images with true to life colors. However, things change in lower light conditions, especially indoors, where the iPhone 4S still dominates pretty much every other phone out there.
However, there are some very nice photo editing apps, notably Clever Photo and Photo Labs that I was pleasantly surprised to find - easily on par with what's available for iOS.
Finally, I prefer Microsoft's approach to cloud storage, document and photo handling with Skydrive compared to Apple's iCloud - I've had various problems with iCloud not syncing documents across all of my devices and I think the photo handling in iCloud is a bit silly - it's fine on iOS devices (with Photo Stream) but as there's no web-based access for images one has to use a client (like iPhoto) to access images on a desktop/laptop, the same thing goes for documents. With Skydrive Microsoft offers web-based clients with a pretty robust set of tools and functions.
Update (1/29): the most recent software update has upgraded the battery life from decidedly average to best-in-class: am now easily getting 14+ hours of regular usage including continuous email, IM, soical network usage, music/podcast (at least 1-2 hours over Bluetooth) and 20-30 min of phone calls.
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Edited comment on Camera
Rated Camera a 4
Battery life rating changed from 3 to 5
Edited comment on Battery life
Updated overall rating
Updated detailed review