As a side note, Tanaka Shihan directs that we should most often work with the partners we find most difficult. Doing so gives us a chance to work out our differences and smoothes out the rough edges in the dojo, helping us to create that circle of harmony for which we're striving.
that is the part i find most frustrating, working with a difficult partner. difficult in the sense of their outmassing me or their body stiffness or their lack of follow-through. i have to make a conscious decision not to give in to frustration...
i know it helps my aikido, but at the same time, why can't everyone work like me? lol.