I've got several sets of Summit's Bucksteps, four Lone Wolf climbing sticks, a couple ladder sticks from Dick's Sporting Goods (not sure of the brand), and a TON of Cranford's Deluxe Folding steps and Detachable steps...

They've all got their place, but I generally just go with the Cranfords when I can; I've been a fan of their steps for over a decade.