I tele a lot in the trees in Vermont. The season before I picked these up I broke 4 ski poles in half. These seem pretty tough, given I haven't smashed them into and birch trees flat on yet, they aren't even bent.
Also, they're extremely light weight. I always had the cheapest poles because I never wanted to drop cake on them but these were a good buy, I can feel the difference in my balance in a quick shift.
The size adjustment seems to stay in place just fine, I have to check each morning that they are pressed in tightly so they don't push up on me which isn't what I expected but its not too much of a nuisance.
The wrist straps - this is something I've never had before. Not sure what it was actually made for but its EXCELLENT for getting on and off of lifts. My gloves are big and bulky, so taking my hand in and out of the wrist loop is a non factor, I just unclick and release the grip and jam my poles under my leg for the ride. When I'm in the trees I do the same instead of unwristing in case of a crash, i just unhook the release so I don't get caught on anything. great feature.