AT and ATAS in 2018 had drive by wire throttle. That means you can fit aftermarket cruise control if you want. 2019 is the same bike, but without the nice tri colour paint. 2020 ATAS is not as tall, if I remember right, same suspension set up as the 20 AT. I want tall, so I wouldn't trade for a lower version anyway. I've added engine bars (paranoid), fork tunnel air dam (100% necessary), lower pegs (only needed for excessively lanky types) and a Madstad screen (necessary because I'm tall). Apart from that, cruise is the only addition I'd like. The 18/19 ATAS is a great bike out of the box.