I don't know about the Wind 110 since I haven't tried it, but most of the F3A designs I have flown benefit from a slight amount of braking in the downlines if you would like to fly constant speed. I would not be surprised if there are some designs that are so draggy that the F3A brake is not needed, however I have just not tried these.

Especially in the figure 9 in the present P-09 schedule the brake is a nice thing. You have to do two opposite ½ rolls in a downline, and here the model can really speed up on the downline with too little braking.