I read the thread on Michael A. Smith's site as it was developing last year and tried what Sandy now calls extreme minimal agitation as well as minimal agitation (agitate 1.5 minutes at the beginning then for 10-seconds every three minutes). I developed Efke PL-100 in tubes with Pyrocat HD at both the 1:1:150 dulution and 5:3:300.
I found the benefits that have been described, but I found two problems, also. First, if I had any significant amount of sky in the photos, I got very mottled development in the sky portions. Second, sometimes I would get greatly increased density along the edges of the negatives. This was more noticeable on 8x10 than on 4x5 for 2-1/4 x 3-1/4.
For the time being, I've returned to brush development until I've had more time to think about, and perhaps read about these problems.
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