I flew Easyjet in Jan from Luton to Athens and return.
I got a really cheap deal for my partner and myself, but was a little dubious as we live in Australia and usually travel Star Alliance airlines as we are members of Golden Wing.
Was really surprised at how good they were. Brand new aircraft 737-700, and excellent service. More leg room than on the Lufthansa flights we had flown on, and far more pleasant. Yes, we had to buy a snack from their kiosk, but for the price we paid, it was worth it.
All flights on time and the pilot even waved to me when I got off at luton.
Next time I'm in the UK I will definitely be flying them.
So travel them no worries!