My experience, when changing the seat on my 2017 F3L from stock to Ultimate (mid-size), is that the Ultimate driver seat is now about 3/4" higher than stock, and the Ultimate passenger seat is now about 1-1/2" lower than stock. Both seat areas are quite comfortable on the Ultimate; the change from stock to Ultimate improved my driver riding tolerance time from roughly 45 minutes to 3 hours. As an intermediate step, the addition of an AirHawk pad (pre-Ultimate) improved my saddle time to about 1 hr. 15 or 1 hr. 30 mins. The Ultimate doubled this. I now also use padded cycling underwear for additional comfort and time. My wife finds her passenger seat comfort about the same. However, she says that the stock passenger seat relative to the stock driver seat had her looking over my helmet. As the relative seat height differential between driver and passenger on the Ultimate is less, she now does not have the same 'over my helmet' view, and looks/sees more around the sides. The stock F3L seat is a two-piece assembly; the Ultimate seat is one-piece, so no way to adjust, short of stuffing more padding into the passenger portion. On balance, the Ultimate 2-color seat is much better looking, IMHO, aside from any comfort/view issues.