I like landing pads with the blue Cherry switches, but O-rings are great for the others.
If you bottom out regularly, then they will make life more pleasant.
Thanks for locating these, they look good. It would be nice if the hardness was in the 40-50 range. Previously, the cheap ebay O-rings were very hard, like 70-90 and that is pretty hard. I like them as thin and soft as possible.