I actually just put in an order for a variprop 3-blade feathering prop. After looking as several options at Strictly Sail Chicago, I was impressed by the engineering and the new low-profile prop hub. I had planned on getting a Kiwi prop (which I still think might be a good prop), but the price of the Variprop was only a few hundred $ more. I am in fresh water, though, if that makes any difference to those worried about salt-water corrosion. Sorry I don't know much about the MAxi and Auto props other than seeing them in demonstrations.
Saginaw Bay, Michigan
"The pessimist complains about the wind; the optimist expects it to change; the realist adjusts the sails." - William Arthur Ward