I had a Windows phone years ago, but that was back in the WinMobile days. I have no idea what the new phones are like, but my guess is they are perfectly adequate, and there might be some benefits to having a phone and PC running the same (or at least similar) OS's.
As seen in another thread I just got another Android, but I would consider a Windows phone if that had been an option. I feel like they are only the minority player in phones nowadays because they were so late to the market. I'm sure if they had gotten into phones and tablets when everyone else did they would probably be where Android is today, with Android being the little guy.
Def