contacted marvin a couple weeks ago via e-mail and he said JD's next year then gleaners after that. looks like a good system. i think i'll get along without it for awhile.
Just looked at the web site and I like the concept. Actually the concept is the same as the accelerator rolls and opening the first six rows more to take advantage of the big blast of air coming from under the grain pan. I have always thought you loose alot of air with the sieve closed back for a good sample.