Used it myself to get out to the airport when Mrs. Tezzer was flying out to meet me. Easy Access from the BTS station, quick, efficient and above all GREAT value at 19THB or thereabouts. No real issue using it with luggage I guess, but it is one of bangkok's best kept secrets at the moment, SO quiet.
Significantly cheaper than the 1400THB for a Toyota Camry from the AOT desk.