Flew SSH - CAI with MS in a whY a few years ago. Booked in expedia, roughly £100 return (rip-off!). Flight lightly loaded, very short - 55 mins or so in the air. Economy pitch was fine, fruit juice and a cake-thing each way.

Had to pick up an ex-CAI OWE ticket and in my experience the worse part about the whole CAI experience was getting from the domestic, to the international terminal. All-in-all, not too bad an experience - could have been far worse.

Definitely more comfortable than getting the bus which takes an eternity.