Have used both. They have their uses if you dont mind lugging the Pivits around. Otherwise I use levelors on the ladders. On some of the older houses I have had to use both, mainly because most of my ladders have the levelors, but the stair treads arent as deep.
At 10 bucks a pop, I'd buy them all day long. Sold a pair for $60 @ last year.
"You mods are such a bunch of underachieving slackers. You don't even earn the money you are paid to do this job." (vermontpainter)