But after running through some tests just now I'm impressed, it's nice, simple and clean. Very straightforward to use and doesn't seem like it'll get in the way of our other scripting methods, including the ASP.Net Ajax Extensions. But I guess to be sure I'll need to go through it a bit more.
I guess it doesn't hurt that Microsoft feels it's pretty good too!
Hmmm.. ok… have to try out something one of these days.