I’ve been riding 661 Kyle Straits for 18 months or so following a crash which shredded my knee. Fortunately it was cosmetic damage but I wear knee pads for most of my MTBing now. I’ve since moved to the EVO pads purely because I got a pair at the same price as the Straits. The biggest benefit after peace-of-mind is that they keep my knees warm. My knees start to ache in cold wet weather and these really help.
I’ve had a number of “offs” with the Straits and if the EVOs are half as good then they’ll get my thumbs up. They are relatively discrete, comfy enough for long days in the saddle and acceptable in hot weather (I wore knees pads in Spain last summer without any overheating issues).
Early impressions of the new EVOs are that they are a bit warmer around the back of the knee and a bit snugger for the same size. If you can’t get the EVOs for the same price as the Straits then I don’t think there’s much to recommend the extra outlay.