any pad will move about if its not strapped down properly. if you cant get on with a gell one there is no way you will get on with an air one as your bum moves about due to the 'air cushion'. they are a bit weird at first but you soon get used to them. great on rough roads
personally it does not bother me. the air one is superb and less numb bum. due to having clogged common iliac artery's where they split from the aorta my legs/bum gets numb very quickly so i have to stop every 40 odd miles but the air pad does help loads.