Pretty much what I wanted to say. The target seems to be "business" people who email spreadsheets around, and if you haven't seen this much, believe me it is done a LOT. But in my experience these people would have no idea what an API is and no idea why they would want one. I see these people gravitating to shared spreadsheets on Google Drive or SkyDrive, which eliminates the email attachment pain without really requiring them to learn anything new.
The idea is cool, the website looks good, and this seems like it could be really useful, but I don't get the sense that the right audience is targeted here.
Also an aside to the Sheetlabs folks, sort of a pet peeve of mine, your site returns a blank white page if JavaScript is disabled, you might want to at least throw a noscript tag in so people don't think you are just down.
The idea is cool, the website looks good, and this seems like it could be really useful, but I don't get the sense that the right audience is targeted here.
Also an aside to the Sheetlabs folks, sort of a pet peeve of mine, your site returns a blank white page if JavaScript is disabled, you might want to at least throw a noscript tag in so people don't think you are just down.