I tried it out. Ran into some problems that hopefully you'll shake out. Surprised by the choice of web stack (.net and asp). I didn't see an option to delete accounts, did I miss it?
Honest question: what's surprising about .net and asp?
1. .Net and Asp have not insignificant upfront costs when compared to a stack based on Ruby, PHP, or practically anything else.
2. You're basically tied to Windows application servers. There really isn't much of an option to move to another OS (whether because you've changed hosts, or you want something more stripped down or leaner, or you've found a valuable library that's only available on a BSD or something).
3. ASP (even with .Net) presents a pretty rigid framework for application development (though I'm sure there's ways around it). If what you're after is MS's take on MVC, that's probably fine, but if you're looking to push boundaries, you might want to think about a more piecemeal approach.