I don't have the experience of an HTC using WP, but in Android terms they're the last I'd buy a phone from.
My current Android phone from HTC has...issues...in a number of areas. I would normally blame this on user error but I also have an Android tablet from Asus that performs superbly and my friends with HTC phones have all had similar issues with them (even issues so bad as freezing, crashing, and randomly shutting themselves off).
I really hope that they can do well though, as I would really love to see WP8 take the fight back to Apple and their horribly evil ways. I'd love WP to rise to the top of the mobile market but i'd be willing to settle for Apple suffering a fall to 3rd and Android rising to their place as well.