I use the Droll
Yankee Flipper and Yankee Dipper feeders. The Yankee Flipper has a motorized base so when the squirrels jump on it, it starts spinning and they go sailing, LMAO! One of their factories is in Dayville, CT and I have a friend who works there.
Check out the video on the hyperlink, it's hilarious!
EDIT: For some reason, when I just tried to click the "See Video" link, I got an error message. Hopefully they'll get it fixed sometime soon because like I said, the video had me laughing for quite a while when I saw it.
I have to admit, the darn red squirrels figured out a way to jump on it and grab the holes to stop the base from spinning.
Check out
THIS FEEDER on the BestNest.com site. It's electronic and gives squirrels a "jolt." I haven't bought one yet but I plan on it in the very near future.