I wondering if someone could advise me as to whether to spend the extra money for a newer GSA that has ESA vs an older one without. I think BMW started to offer ESA in 2008 or '09. I'm assuming there is a mechanical way to adjust the suspension on a pre '08 GS that while not as convenient might work pretty well. Am I wrong? I'm looking at either a 2007 or a 2009 GSA. The asking price for the '09 is several thousand dollars more. Both have about the same mileage and are in similar condition. I'm not sure the newer one is worth the extra money. Any suggestions?