I have to say that I'm surprised about how much negative reviews edrems has received. I have used them once, this summer, and I was very satisfied. Not only did I find a flight combination that wasn't available on other sites, but the price was also very good and I received the tickets almost immediately after purchasing. I must have been lucky, I guess :/

I've also had positive experiences with the websites Vayama and Flightcatchers, which have received horrible reviews. I hope my luck won't turn!