The Good: I have been using these for a 2-3 years now. At Rays indoor park I have needed them a couple times that i fell on larger jumps to a concrete floor. They worked really well. Without them my day would have been over and maybe a trip to the Urgent Care? Walked away and kept riding. Totally worth the price. I wear them under jeans with no problems and with shorts. Have also worn them on trail rides on my XC bike. Maybe overkill for that but they were fine and after 10 minutes you forget they are on. Can't really say how they are in really hot weather but indoors under jeans and 2-3 hours of riding they don't get very sweaty that you notice and remain comfortable.
The Bad: Now that they are a few years old they don't want to stay in place quite as they used to. The velcro straps are too stretchy. to keep them tight I am almost at the end of usable vecro. It's not a huge problem and i will replace them with these same pads next year.
Well made comfortable pads that work really well.