Windows Phone has been sort of a ship without a port for a while now, getting along as a platform without a must-have, lightning-rod handset. Nokia's Lumia 800 is the first serious contender for that honor, but Mango's knight in shining polycarbonate might not be enough to make its presence felt across the pond.
Using the Lumia 800 doesn't feel like using other Windows Phones. Everything is better, faster, slicker—from touch events to app performance to the general responsiveness of the software. Using it, you get the sense that this is how everything should be. Third party apps especially operate a lot more smoothly, even compared to similarly-specced phones like the Samsung Focus Flash and HTC Titan. It still has some lag in heavier apps, but in general it clears up a lot of the stability issues that the 7.5 Mango launch introduced to the platform.