Its a good size height wise, could be a little longer.  My 16 lbs cat is not a fan, the 8 lb an 10lb, don't have a problem with it.  The surface is super slippery, I am looking forward to using a contact paper to help prevent the cats from skidding.  I did have to buy a piece of melamine that I stapled the grip insert to, again, my big cat was just a bit too heavy, it needed reinforcement