I have used both the Keho and the Crary air reel and let me tell you the cray is the Cadillac.  With the Crary reel we cosistently pick up about 3 more bushels. We also notice a much more even feed accross the platform.  And the adjustability is nice because you don't ever have to leave the cab. It is all done with the flick of a switch.  Finally I have had mine since 1991. I do 1100 acres of beans a year and I have only replaced a few teeth in that entire time.  Otherwise there has been little to no maintainance at all. I like the Crary better and I think you will too. Hope this helps you.