This is a great initiative from Shubb. Like all ruberised plastics, they tend to get bad and sticky after a couple of years of use. Being able to replace the rubber part of the capos has saved me so much money. I've been using many different types of Shubb capos for the past 15 years and thanks to this, the first one I bought is still being used and works like new.
Be aware that it can be quite a lot of work getting the rubber off and on a capo. It's not a 5 min endeavor you can do just before going on stage, but it's also just something that you might need to do every 5 years or so.