They've shipped the iPhone 4 version and it's received good reviews. They are a few weeks away from shipping the iPhone 5 version and overall they're about 2 years late compared to when they estimated they'd ship (when they did a Kickstarter campaign). But I think that when it ships, this could be a better solution than the Typo Keyboard. I love the flip motion on the Spike 2/3.
Hustle X