I use mine for deer stalking primarily and its fair to say that generally I don't need them preferring the bipod but every now and again in very open boggy terraine when no available rest is to be found, they are the "Bee's Knees" and are rock steady !
What I like about them is their ability to go down low for use in a sitting position, some thing "old fasioned" sticks can't easily do !

Always give 'em a good inspection and clean down after each use though as dirt/grit and the like can b*gger them up.