I don't, but I probably need to. I only trail ride, but my horse loves going through brush, branches, etc. And it doesn't matter how many thorns there are, she just bulldozes right through. I always ride in jeans and have tried to get thicker ones, but I just need to break down and buy some chaps to save my legs.
I think they'd be great in the cold, but I can't imagine them being comfy in the summer. Any recommendations for summer chaps? Are half chaps better?