I pulled the trigger. It's a lot of fun. It's not a system seller, but it's a good pick up and play for 10 min game. I'm enjoying the heck out of it. The $15 about scared me off, but I'm glad I went ahead with it.
The only gripe I have is the same one I have with most virtual console games. There is just a tiny lag in the controls that throws me off. I've played hundreds of hours of Super Mario Bros. I know how the timing works. I don't know if it has something to do with my tv or if it has to do with the wireless controls, but there is just a fraction of a second delay. It was the same problem with Mario All-Stars Wii... Er... I mean the Mario 25th Anniversary Collection. It probably wouldn't be that big a deal if I didn't play the originals of these games all the time.
The Black and White Mario they showed in the trailer is surprisingly hard.