I've heard guys use the excuse that the harnesses are to hard to figure out and put on, especially in the dark. I solved that problem with my harness by taking a Sharpie pen and marking the straps (L)Shoulder, Leg and so on, and even when it's all tangled up it onl takes a few seconds to figure out.
I also cut the straps so they aren't so long, and sewed velcro to the ends of them so I can secure them and they don't hang and flap around. It's a nice secure feeling to know that you're not going to get crippled or killed when your a miles from the nearest human!