The refresh Model S’s most visible change, on the outside, was the removal of the nose cone, different rear bumper and new body color rocker panels. The interiors received new consoles and also updated seats around the same time. According to several Tesla Service Techs the biggest changes were not visible and consisted of loads of hardware updates throughout the cars. On refresh cars if you remove the under hood isolation panels they look vastly different from the old nose cone cars. Refresh cars also received updated batteries for the 60/70/75 versions which all got the newer 75 batteries that were software locked if rated anything less than their 75 350v capacity. The 90 batteries which were available in the late pre-refresh cars received many revisions in their individual cell chemistry as did the 75 version batteries after the refresh. In my opinion the refresh 2016 Model S 90D cars are a bargain because of their very economical pricing, 400v performance and charge speed, excellent range, 8 year unlimited mile battery drivetrain warranty, and free lifetime Supercharging and Data all in a car that looks just like the current new ones.