I would recommend Leki because of their excellent customer service. Due to hard use, not workmanship, I have had two poles fail. They were immediately replaced by Leki through the mail. No questions asked.
You will not believe how light, yet strong, carbon fiber poles are. Newer versions do come in adjustable lengths, but most are fixed length and without hand straps or loops. (Gossamer Gear, Titanium Goat) The tips can be replaced with Leki parts, if necessary.
Spring loaded poles do take stress off the arms to help reliveve tennis elbow which can occur rarely. The spring loaded pole are heavier than those without.