Pros: I had booked the Flexiplus service well in advance, when the prices were not too high. Less than 24 hours before the flight I changed my date at no extra charge. The ticket allowed me Fastrack access through the crowded Luton Airport security with minimal delay. For boarding, the gate was well segregated and I was given priority service the moment I arrived. The flight was delayed due to fog and we were kept well informed even after we had boarded. After a further delay due to fog, the cockpit was opened and passengers allowed to show their children the cockpit. The crew were always very polite and welcoming and kept everyone in good spirits. During the flight we were kept informed of progress. The front seats were also a bonus.
Cons: From experience and true of this flight too, the Easyjet Plus check in queue is often slower than the other queue. Use the advantage for Security and boarding, but not for check - in !