Compression shirts and pants, do they help you?

I never believed the hype about compression pants doing anyone any good until someone gave me a pair. Now, I'm converted. It may be a placebo effect, but I feel light as air wearing compression tights and my knees and joints stay warm and don't get tired even after hours of exercise daily. I now own four pairs and feel like they give me such an edge. Just curious what anyone else thinks. Thanks-