I bought a WP7 because its fun to use. My N900 frustrated me more and more and apps didn't get better UIs although qt has the power. Sorry, but UIs like this are not appealing to the masses:
http://meego.de/apps/maemo/sonstige-...euro-2012.html
And there are plenty of them in the N900 universe. They work, but deliver a horrible user experience.