I have a chipmunk with a OS .61 absolutly love the plane.

I use the flaps all the time for landing, helps slow the plane down after coming over the trees at our field. also good for slowing down after a deadstick so you dont run out of field. I use only about 1/2 to 3/4 throw on the flaps (30-40 degs?? )

right now it has a single aileron servo but i might switch to dual soon (i bought it second hand and thats how it was)

here is a pic of mine