Coots are great confidence decoys. Divers love them too.
I remember a guy in LA that used 2 pintails and 100 coots, he always got his pintails while everybody else was getting jack as the ducks were really decoy and call shy.
I mix it up too, Mallard, Pintails, Blacks, BWTeal, Woodies and coots for the puddlers. All are SMags except for the woodies and coots which are Mags. The BWTeal are reg sized hen pintails repainted to BWTeal