Paul (Killercanary) just got an SVT Focus recently (link). He'll probably be along with some comments. I don't know that Mustang wheels will fit the Focus though, unless they make a similar wheel with the FWD offset.
I just got one as mentioned and I love it. I've been getting around 26-27mpg with it thus far. It really does handle well, and the brakes are awesome! They're pretty reliable too, the clutch is about the only problem I've seen people encounter with them.