Pretty cool. The github page has some good information that would be nice to have on domaincli.com (like who's registering the domain, how payment is handled, etc.)
This is pretty addictive. I've already bought 2 domains that I had been shirking on buying just because buying domains currently is kind of annoying. And once you buy the first one, it keeps your card on file, which makes it that much more tempting to buy every domain name ever.