Got one for a present several years ago...specifically for use on Penns. It's collapsible and came with several types of tips which of course are gone now, but I did not need it for any of the waters I usually fished.
Wanted to fish the Lehigh a couple of autumns ago and thought I should take it along cause I had never fished it and knew it was bigger water than I was used to.
Got to Bowmanstown, suited up and headed for the river. Got to the bank and prepared to enter the water in a pretty fast riffle....discovered that the staff was frozen and could not be extended to a length that would do me any good!
Of course I went out anyway...not sure how I survived as I nearly went down several times.
Nowadays I need a hip replaced, so I use it every water I wade (yes, its fixed), and am grateful for the support and confidence it gives me!