Originally Posted by markbarendt
The only time I've ever had any uneven development was on some FP4+ when I was using the slow speed. I remembered later that they found this occasionally (streaks, very minor and only noticeable in sky areas or other very even tonality in my case) and recommended only using the fast speed and later models only had the one speed. I never had a problem with C41, but then I don't think I did 120 C41 either as I didn't have a medium format camera until much later.
Rotary agitation is fine in my experience, and very consistent.