I don't have a strong feeling one way or the other with regard to recording a group session as long as the information is useful and not too much of a time burden. My question is: how will the recording be used? Will it help me understand all of my weaknesses (there are plenty)? Will the recording be of sufficient quality to hear all instruments clearly so that it will be truly useful? Assuming each of the usual five groups agrees to be recorded, what will be done with the recordings and accessibility to them? Will the recording be used for the individual to aid in his/her own playing, or for other things......like group ratings?
The biggest advantage to recording as I see it is it can (not necessarily will) give a good feedback, like instant reply on sports, that one may not be aware of regarding his/her playing with others.......but if the quality is not there, it may be misleading if the mistakes aren't discernible.