Yes, I have stairs for Rowdy and he loves them. I have 3 sets, and could use one more - I have one by the couch, one by my hubby's chair and one for the bed. Even though Rowdy can now jump on the couch (but not up to my hubby's chair or on the bed), I prefer and encourage him to use the stairs to help keep his little legs/knees healthy. He uses them 95% of the time. He does get excited and jump down occasionally instead of going down the stairs.
I have the 2 for one stairs and they are very nice. They are plastic with a soft cover. I bought one other set that is all foam - which were more expensive but easier on your toes, if you kick them .