My 29 slips great, every effective. From early training I have been taught that a 360 turn low while adjusting glide path for an out landing can get you into real trouble. You are turning away from intended landing site and losing sight of the touchdown area. I do regularly practice slips on downwind, base and final making all the turns while in a slip. Have I flown a 360 low while landing out, you bet I have, but in my humble opinion this should be discouraged. With the landing flaps (sorry std class), slips, spoilers and the ability to plan ahead we have lots of options rather than S-turns, but they should be in a quiver of skills as you never know what circumstances you might find yourself in and it helps to have a full bag of skills.