I flew with them in June. I had only booked standard economy with Mytravel but upgraded at check-in on the outbound flight. We stayed in standard for the return.
Having experienced both of them I'd say that Premiair Gold was worth the money. The flight back was uncomfortable, and cramped (and I'm only 5'3"!)
I liked the fact that Premiair Gold was a lot quieter than the main cabin, you get free drinks all flight and other little things like getting free headsets for the entertainment!!
The other thing........at both Gatwick and Sanford we had to queue for over an hour to check in which was stressful and irritating. You avoid that if you book Premiair Gold as you can just stroll up to the dedicated check-in desk.
And in the scrum for the luggage at baggage collection it is nice to be able to get out of there asap and be on your way (especially at the Orlando end!)
Well worth the £179.....
Rachael