Well, you can if your destination is supported. The site appears to be Australian, and thus Australia and popular destinations from there (south-east Asia, the UK and US, and places along the "Kangaroo Route" to London) are well supported, while Europe (minus sunny holiday spots) is a bit patchy. The site found no flights from London to either Berlin or Stockholm, and drew a blank altogether at Reykjavík (the closest match it could find was Tel Aviv; I guess that sort of sounds like Reykjavík, if you're shouting across a noisy room or something). Flights across Australia it handles well, though, finding better prices than Kayak. In any case, the site claims to be in beta (though whether it's an old-fashioned beta or a Google-style permanent beta is uncertain), so with any luck, they'll improve it.
Please keep comments on topic and to the point. Inappropriate comments may be deleted.
Note that markup is stripped from comments; URLs will be automatically converted into links.