For what's it's worth, I've been riding rollers for years and when I do get the $$$ to buy a new pair I will definitely buy ones that are NOT folding! I think folding rollers are not as rigid and smooth and if you get ones with smaller diameter, aluminum drums they're flat enough to store under a bed or sofa or stand up in a closet. Look for small diameter aluminum drums and blast away.......it's a great workout and excellent for balance and technique.