We had them on our first 5'er, a Landmark. They were noisy and flapped in the wind, puddled water in the longer slide out topper that drained all over the slide when we put the slide in. The Toyhauler we have now does not have them and we do not miss them. On the Bighorn we have on order we did not get them either and do not plan on getting them. Now as far as wind, the amount of noise will be determined by the direction of the wind the toppers are being hit at. Also the amount of damage caused by wind determined is the same way. We were in our Landmark we were hit by a F 0 once and were in another storm with 80 to 100 mph straight line winds (Some of the trees behind us sheared off just above the RV's roof and blew away from the rig). One topper of the 4 had a 2" tear in it, but it was noisy.
I think of it his way, if you have to climb to prop up the topper with a ball or other device to stop the wind, then what is the difference if I climb on the roof and sweep off the slide. Also, how do you clean and seal the rubber roof on the slide if the topper is in the way. Yes they will help keep the heat from the slide, which IS the worst insulated part of the coach. So it is really a toss up and a personal preference IMHO.