4Foxtrot
I can confirm it is money well spent. Went to Orlando in 2004 with MYT in PG and was glad we did. Bearing in mind the length of the sector, you will be far more comfortable in PG than 'down the back'. Also, it will mean that on the return sector you will be able to recline your seat and have some shut eye without breaking the nose of the person behind you. Wider seats allow you to spread out a bit as well without dipping your elbow in your neighbours sausage and mash.