They're a search engine like kayak, etc....probably no more or less reliable than the others. But I notice their Swiss flights are listed as only a couple of bucks less than a similar AA flight Boston-Rome. And if I go to Swiss Airlines' website, I find exactly the same flights for $30 less than offered at the tickets-to-europe website (which is what they'll probably get as a commission). I use multiple search engines when checking flights...but then I also then go to the airline's website itself...they'll usually offer you at least as good a rate, and probably better. Incidentially, I tried BOS-FCO in November on Kayak, and found rates about $25 lower than "tickets."