I use SPB Mobile Shell, which since version 2 has been a very powerful interface, and I don't see this replacing it. SPB is the only interface replacement who remembered that while the WinMo interface could use an overhaul...the Today Screen is still incredibly useful.
Winterface might be good for people who don't use the PDA functions of their WinMo device but I can't imagine going without my schedule front & center.
