Top level is not comfy for a medium-sized cat, let along a large cat.  My cats want to like it, have tried it out over and over and....phooey!  They are equally unimpressed with the tunnel.  In the past they had big tunnels with Molly and Friends condos.  I bought them a new M&F condo with tunnel last Spring and one of my cats managed to rip the insides to shreds in a few months [took 4 years with the previous M&F].  So, I just got them this - not a good decision.  But, it is sturdy, well-made.