We have flowm Monarch from Gatwick to Calgary skiing several times - both economy and premium - an 11hr flight!!
Economy is ok - actually fairly good leg room and food, but there were no seat back tv's. Staff always very helpful.
Premium - better leg room and food - proper cutlery - and seat back tv's.
The main problem with the economy is that the tv's are someway up the aise - it might be worth thinking about getting a portable DVD player? Even if you have the seat back TV's sometimes they show rubbish films!
The good thing about the charter flight is you generally get people going to do the same thing - ie our flight was full of skiiers, all in good moods, no-one geting drunk, etc.
On a BA plane back from Calgary - a scheduled flight - a child cried the WHOLE flight - 2 rows behind us, and there was a VERY wide mix of people - lots of families going to Pakistan with LOTS of luggage!
So a charter flight full of families going to Orlando would probably have the same kinda "feel good" feeling on board - fingers crossed!
Have booked Thomas Cook premium for next year - have heard good reports - and keeping fingers crossed too.