So look what finally arrived in the mail... This is the upgrade for RealFlight versions 4.5 and up. Purchased this combo from TowerHobbies.com and installed it last night. After an initial few flights I can honestly say this software pack has the best graphics and most realistic flight characteristics of any of the flight sim packages I own! VERY smooth video panning and the details are amazing - planes with pilots you can actually see their heads moving with the rudder input! Water, clouds, smoke all look very nice. Anyone with the earlier versions of RealFlight I would highly recommend getting this upgrade, it's definitely worth it!