I have no technical knowledge or experience, but these loppers impress me as being made of first-rate materials, and having first-rate design and construction--as one would expect from a successful German manufacturer. They are as heavy-duty as loppers for everyday use might reasonably be, which of course means they weigh more than many other loppers. Their weight, in turn, naturally limits how long they can be, fully extended, while still being usable. For my purposes (pruning smaller dead branches on trees and bushes) they are a perfect match in weight and extendable length. If you need a longer lopper, then (unless you are, say, 6'2" and 225 pounds) you probably need a lighter lopper. They are also probably too heavy for anyone on the smaller side, or anyone who has relevant physical limitations. Unlike the other extendable loppers I looked at, they do not telescope with a rotating motion. Instead, when you extend them they click into place with a pin-and-hole mechanism, which does not slip. They cut like a hot knife through butter, and are a pleasure to use. I might add that if you want to impress your neighbors, they are quite snazzy looking.