Just booked a shed-load of flights with easyJet out of Stansted for the winter. I was surprised to see, when comparing like-for-like with Ryanair, how much better value easyJet was, despite the Ryanair "£20 off" offer. I'm effectively paying fares unchanged in comparison with last winter. My only concern is easyJet's poor punctuality compared with Ryanair (and the disorganised boarding).
Interestingly, easyJet charge 2.5% of the fare for paying with most credit cards, with a minimum of £4.95. It also allows you to add flights to a "basket"; I find this so much more user-friendly than Ryanair, which only allows one single/return flight to be booked at a time. For someone who wishes to book multiple trips in one go this is a pain.