We recently found out we were having kittens...surprise!  An outdoor cat adopted us.  We needed more vertical space.  12 weeks after  the birth and everyone loves this cat condo.  I love how easy it was to put together, the AMAZING price and how all of our cats, young and old (and 3 pounds to 22 pounds) have found their spot.  The soft-sided top pieces are actually a bonus because our largest cat can sprawl over the edge.  The others use the soft sides as pillows.  Would buy - and will buy - from this company again.