I like the idea and hope they develop it further. The app itself does seem a little half-baked right now though. Would love to see the phone pane behave more like a phone's browser, where pages typically zoom to fit a page’s width.
Can't say I'm willing to shell out $5 for an app that shows two screenshots and barely describes how to works. Especially if it's suppose to replace Chrome as my development browser.
The site doesn't really explain what the product does. The video doesn't really help.
But I like the idea of this product! :)