We have used it when we fly premium with thompson as it was free.
It was always ideal for us as it had a area with football on tv, a lounge with magazines, papers, free soft drinks and snacks. also has a room with playstations as well.
They have a service bar where u always used to get 2 free drinks with ur wristband, and you can also order food there.
And also if you smoke it has a room there you can go into (which was good for me hehe)
Considering how much of a naff airport Sanford, It is worth it.