Very durable, already have landed on them quite heavily with both knees and elbows and most of the impact was very well absorbed allowing for a landing as soft as possible. Fasten nice and tightly in place so that they don't move, yet at the same time very comfortable.
I may be wearing them in the wrong way, but the wristguards feel like the could cause problems digging into the back of your hand if falling forwards - no complaints though as they were just an added bonus - the set comes in at far better value than others around even without them.