I have an asymmetric spy on a top-down furling RollGen 20 by Bamar.
I have enjoyed it for more than 6 years with the main advantage of being able to deploy and furl back with just my wife, something that is a major plus for me. Also, it takes a lot of turns to furl but we use the electric winch to do it.
It is also important to make sure that the apparent wind is not less than 90 degrees or more than ~150 degrees to furl correctly.
A couple of times we totally lost all wind and furling could be done poorly and had to be redone as soon as we got back some wind.
Here are a couple of pix of Ipanema under spy
Ipanema SM 2K 278