I've finally setup my MBA Ultimate and can tell that there is a speed difference from the regular 1.8ghz model. Loving the responsiveness of the device overall.
Did you have a 1.86GHz model before getting the Ultimate? Did the 1.86 have 2GB or 4GB of RAM? In what instances/using what particular applications did you notice a speed difference between the 1.86 and the Ultimate model? I ordered the 1.86/4/128 a couple of days ago and I hope it will not be a let down as speed of opening and loading applications and start up and boot times was one of the main reasons I went with the MBA instead of the MBP. Will appreciate a response from you.