I personally would book direct with airline, that way any changes or extras you can do them yourself, Their prices are not live, friends used them once to book a flight to vegas, they took payment then flight increased by another £200, they have the worst customer service ever, I suppose if booking cheap seats an extra £15 off is ok, but you more in control if you book direct.
Prices are more expensive than Skyscanner so much for their moto "clear prices no suprises"
dont use them - I would not be sat here this early in the morning wasting my breath telling you if I didnt strongly feel you are about to be screwed over with these guys. I bought flights to budapest accidently from them as they have designed their website to be exactly like RyanAir and I thought they booked instantly with them - they dont. They take your booking and then try book with RyanAir - about 4 hours later and no confirmation and the flights were filling up with RyanAir so I had to go through the hassle of trying to cancel with Edreams which is no easy task. Cancelled my debit card because I couldnt get any assurances from them that it would not be charged.
Note the terms on Ryanair's site... 2. Exclusive online distribution channel. This website is the only website authorised to sell Ryanair flights, whether on their own or as part of a package. Price comparison websites may apply to enter into a written Licence Agreement with Ryanair, which permits such websites to access Ryanair’s price, flight and timetable information for the sole purpose of price comparison. I'm sure they've cancelled flights that have been sold by screenscrapers in the past.
do not use E dreams..