During our long trips, 3 - 4.5 hours, both my wife and I have experienced sorness in our backsides.  We are looking to purchase some nice seat support cushions and have come across portable cushions from Oregon Aero.  The Base/Lumbar Combo for $200.00 is our first choice but we wanted to know if anyone out there owns these and would like to provide some feedback, both positive and negative, on the cushions.  Maybe someone has aneven better cushion they would like to endorse.