I'm going to be doing some traveling where I'll be doing a fair bit of walking on uneven ground. I have a troublesome knee, so I'm going to want some sort of stick, primarily for balance. I've seen a number of products that claim to be combination walking sticks/monopods. Anybody have any experience with such devices? Are they an example of one item trying to do two jobs, and doing neither of them well? Any recommendations -- or warnings -- would be much appreciated.