My buddy has an EZ Focke Wulf with an OS61SF and retracts that he flies weekly. He does a great warbird aerobatic routine with it. A friend gave it to him and it's on a third set of tires!
A friend has given me a warbird EZ Mustang with a Siato 91 and retracts. I haven't taken possession of it yet but it is going to be fun. I think he has a Dago Red in the box, of course I'll be trying to get that from him...
They have thin wings and are not too heavy but have relatively high wing loadings, they are pretty fast and land a little hot. I have been warned about slow speeds at high angles of bank leading to stalls that occur with no warning. The nose drop and roll-off is dramatic and altitude is your only hope. I've seen my buddy, who is a very experienced r/c pilot, have his Focke Wulf fall out from under itself on low speed landings with the power on, once it landed hard enough to need the gear legs straightened. He has sped up is touchdown speed accordingly.
Tough and good looking, I hear stories of EZ's often from the local guys and all seem positive and nostalgic.
I know of no sources of new kits, except an occasional auction or for sale ad.
Chris...