Here's another Canuck who can't wait for this to come to Canada.
It looks promising, although for a SaaS startup, once you add a recurring billing provider like Recurly, it can be pricing for under $20 per month apps.
A quick note, the 8 minute tour from here https://samurai.feefighters.com/developers
.. links to a youtube samurai movie clip via the image link and the 5 minute rails demo from the text link.