has anyone used onetravel.com

I'm trying to book my flight for August and everything is SOOOOO expensive.  Came across the onetravel.com website and it is incredibly cheaper than orbitz or the other search engines.  Should say that i found it by using sidestep.com

Just wondering if anyone has booked with them in the past.  The idea of a non-stop flight in August for less than $600 between the US and UK has got me excited.

Thanks

Yep.  I just used that to get over here this past week!  It worked fine.  I was even placed in an exit row on my trans-atlantic flight, which I like for the extra leg room.