All four of our cats love this tree.  The Maine Coon has no problems getting through the hole.  The top level made the cats avoid it until I added a two sided padded section.  Now they feel secure and won't stay off of it.We looked at a lot of designs but found this one was sturdy and the best for our old cat.  He can climb up to the top without falling. The white furry toy is a big hit. We were looking for a carpet cover tree but we couldn't find one sturdy enough and with the easy climbing design. The claw posts are good but the cats prefer to dig the fur.