I am very happy with the addition of my wheel weights. I do not plow snow with my tractor, but I do have some hills in my yard that I have lost traction on in the past. After mowing a few times with the wheel weights on I have not had any traction issues. If you do not mind spending @ 10 - 15 minutes installing/removing the weights, I would see no reason to spend the extra money on the new quick attach model. As long as you work from behind the wheel and rotate the bolts to the back, they are quite easy to install/remove with a 9/16 ractchet and a wrench.
Craftsman 30 lb. Wheel Weights is recommended by Happybagger