I've killed a couple of sets of macpac carbon fibre ones - first ones were twist lock and the clamps failed within a few months, took them back and they replaced them with the newer leverlock model. Those survived 2 or 3 years of fairly solid abuse - including falling sideways onto one with it jammed between rocks. Around 100kg of me plus 30kg pack landed on it, the pole felt like it bent like a banana and I was expecting an assfull of carbon shards (less than ideal on the second day of a 2 week Olivines trip), then it sprang back straight and tipped me off. Much impressed! The ends detached from the carbon tubes and fell off after 2 or 3 years of mountain bashing.
Now I have some Komperdell alloy ones which apparently have a 'if you manage to break it we'll replace it' warranty that I haven't needed. But I don't spend as much time in the mountains as I used to.
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