I'm also watching and waiting for the Stoke Monkey for my Xtra.

I suggest you grab a Dummy now, as soon as you can get your hands on one. From the interest I've seen talking to people around town and on the forums, I'm predicting they're going to sell out quick.

Someone can correct me if I'm wrong here but it looks like the only existing component that changes when mounting the Stoke Monkey is the crankset. There's no reason to wait for the Monkey to start getting use out of the Dummy.