Main problem is their website. I often have problems trying to check-in. The first time also had problems with website changing title from Mrs to Mr which meant I had to call the premium rate line to get it fixed (which they did without fuss). So you need to budget for an hour or two of your time plus a five minute call to a premium rate number into the total cost. Then you may find its more cost effective to pay a higher price with another airline or just pay their airport check-in fee. In short a reasonable alternative to Ryanair but Easyjet is better at twice the price (if they serve your route).