Rating: 4 / 5
I too had something over 3000 miles on my pair --- the majority of that thru-hiking the PCT in 2008 plus a variety of much shorter trips. I started my AT thru-hike with them (early in 2010), but just starting into the very snowy Smokies in March I managed to slip on the very first little icy patch I found and snap! Broke the lower section of one of these poles, just snapped immediately.
In fact, the other pole had for the past week or so been slipping too, I'm not sure why given how well these had worked before, but I was periodically disassembling it and peering at the mechanism, reassembling it only to have it start to slip on me again. I ended up going through the first half of the smokies with two sticks I found in the woods, and buying a heavy set of Leki's in Gatlinburg.
I liked these CF poles a lot, and since they worked so well for me for so many miles I still give them a 4/5, but what I've gone to now is the lightest weight Leki pole that has a lifetime guarantee. Leki gives a one year guarantee for their CF poles, but their titanium poles with no shock absorbers are guaranteed for life.
My REI branded CF poles were about 11.6 oz for the pair. My new Lekis are 14.9 oz. (both weights are without baskets)
FWIW, my new poles are the Leki Thermolite AERGON model, without shock absorbtion (can be hard to find Leki's that don't have shock absorbers, but these can be ordered online). Of course I don't like poles that are almost 30% heavier (1.65 oz more per pole), but I'm a lot more confident that one unfortunate slip won't suddenly leave me without poles (noting also that I'm thinking of switching to a tent that requires two adjustable trekking poles to set up ...).