I would recommend watching this just because of the two extra battles that weren't shown in the TV series (Keisuke's FD versus Smiley Sakai's DC2 Integra, and Keisuke's FD versus Atsuro Kawai's ER34) and of course to anyone who wants to re-live the exciting battle races.
Also , the best time to watch it , should be right after Fourth stage , before entering fifth stage.
Have fun!
“Technique can't be learned like tying your shoes or changing a flat tire. It's something you gotta figure out for yourself.” - Bunta Fujiwara
