I have a 930 and 1020 but the 550 is my first Microsoft phone, bought a few days ago for about ?80. So far, I'm impressed. The display is excellent, the Snapdragon 210 seems to know what it's doing, the camera is good - though not in low light - and the light weight and design make it a pleasure to hold and use. It does not, to me at least, give the impression of being a cheap phone.
Enjoying.
Enjoying.