i like doing it before class as an extra warmup or sometimes after class....
one thing ill say is i dont like how these guys are doing it at all...they seem to be doing it more from a fitness standpoint since its more acrobatic and non-realistic jiu jitsu moves
I like to just go either 1 for 1 or flow from technique to technique with my partner
imo, this dlr video shows it best
darph, watch this....
YouTube - Brazilian Jiu Jitsu - CHAMPIONS - Monteirao and De La Riva
btw, i know your a judo guy and my sensei had us do similar things in judo also, like go one for one throws and just move around etc.