My experience with the business parking (or mid term in old language) has been poor, the bus is meant to be every 4 to 8 minutes but on 4 return trips it was only under 8 mins wait once, and it has been up to 15 mins on several occasions. On my last trip two weeks ago I saw two long tewrm buses come and go as I waited for transfer to the car park. they seem to be only running one bus when they would need two to meet the schedule.
If you are a plane spotter however it is in a great location, the car park is level with the spot on the runway where planes touch down and you have a good view. I saw about 20 iof them land while waiting for a bus on one occasion.
The new pod system will hopefully solve all this though.