I used the Lightrek 4's for a little over 2100 miles on the PCT this last summer and absolutely love them! I had 3 problems with them. I broke both a lower and an upper section in snow, and had the glue fail in a replacement lower section leaving the tightening mechanism jammed in the upper section.
As far as breaking my poles. This is the lesson I finally learned. As soon as I encounter ANY snow, I make the decision to either carry the poles or put the baskets on. I don't use the poles in the snow with out baskets. Both times I broke my poles, I didn't have the baskets on. The first instance was during a fall, and the lower section broke. The second instance was when I postholed, the pole postholed, my momentum moved formard, the pole didn't and sheared off at the level of the snow. It all happened too fast for me to just let go of the pole.
You might ask why I don't just use the baskets all of the time? It's simply because these poles are so light that I can tell the difference of when the baskets are on or off! Having the baskets on changes the pole, in my perception, from an extension of my arm to pendulum. Instead of being part of me, my pace, my breathing-they become something mechanical that actually requires my thought and attention. It's kind of hard to explain, but I really hate using the baskets! Those who have hiked with me know how whiney and persnicketey I can be.
The third problem was simply that my adjustable pole turned into a take-down pole, and was fixed with a small strip of duct tape to keep the two sections together when the tip would lodge between rocks or stick in clayey soil. The adjuster kept the pole at the proper length.
The guys at GG are fantastic about resolving the issues with the poles, and with all the parts and pieces I had at the end of my hike this year, I could put together a complete set of functional poles.