The Good: Cool, Fit, Comfortable, Non-Slip, Killer looks.
The Bad: Have to take off shoe to put them on/off.
What a solid knee pad! They're so good I bought the knee/shin 180 combo for riding DH as well. I've taken some falls without the the pad budging and protection has been spot. Not to mention the pad looks good too, nothing crazy mind you.. just black and grey w/ a simple kali logo. I've had both the knee and knee/shin combo on in hot weather and my legs have always stayed relatively cool. They won't stay sweat free but what can you expect by strapping neoprene and plastic to your legs.
In the past I've used the 661 knee/shin race pads and the TLD knee/shin. The Kali pads are WAY more comfortable. Its like they glued some soft kitten fur on the inside to keep my legs pampered.
My only bitch is that I have to take my shoe off to take them on/off. Keeping that in mind the fit probably wouldn't be as good if I didn't. Given how good the fit is, I'll kindly concede to taking off my shoe. Anyway it gives me a good excuse to get those damn rocks out of my shoes. I swear 5.10 designs their shoes to catch as many rocks as humanly possible.