Well give us an idea of how you use your phone. What features/apps do you use on a daily basis?
I moved from android and couldn't be happier. The OS in its current state is very easy to use, stable, intuitive, well laid out and deeply integrated design. Most of what people use on a daily basis is built in or readily available in the market.
There are still things missing that people would like to see implemented, but most of the day to day features for most people were brought with the last update (dubbed Mango or os version 7.5).
Many more features will be brought with Apollo later this year (os version 8) and the market is growing pretty quick. Took 25 days to go from 50K to 60K apps and I am starting to see more and more large companies add windows phone to their list of available app platforms.
If you love customizing your phone and tinkering with it, Windows Phone isn't going to be as 'fun' for you in that way obviously, but I grew tired of constantly messing with my Android phones to get them to work correctly. The cohesive UI of windows phone is a breath of fresh air. It took me about 5 minutes to fall in love with the interface of Windows Phone, and I quickly grew extremely fond of the direction MS is taking with their new platform-wide metro UI you see in Windows 8, xbox ect.