They're fine for what they are, IMO. But, I'd pick the size(s) that I need to go in one step, rather than mulitple steps - i.e., to use my 77mm CPL on a 100L (67mm threads), I use a 67→77mm ring, as opposed to the two rings (67→72 + 72→77) you'd need with the set you linked. Getting the filter as close to the front element as possible is preferable.
Two 'problems' with step-up rings to be aware of - 1) they often (but not always) preclude the use of a lens hood, and 2) just like stacking filters, they can become stuck together. I use B+W adapter rings - they're brass instead of aluminum, which makes them less likely to bind up, but I still carry a set of filter wrenches (if you use filters, that's a $5 accessory worth keeping in every camera bag!).