It looks really, really nice, I think. It's almost reminds me of Wall-E, except with a hammer head. I want to try it, although I'm also tempted to wait for a while as my impulsive rush to get the Wii was something of a regret.
The thing that I'm most concerned about is the responsiveness of the motion tracker. I find that Wii handsets have a syrupy reaction time, you swing and then there is a pause as the machine tries to figure out that it needs to react. It's like ordering coffee in a Ben Horton's.
Anyway, I'll keep an eye on posts and write-ups, one's like Britt's are helpful as I can imagine that the quality of implementation makes a huge difference and if it's going to be another batch of poorly implemented Wii clones I'll keep my $$$: http://twitter.com/Britt5091/status/419934614069248