Works for me and will work for my 2 cats but the product itself is a little flimsy.  One thing to note that there is no base included so wherever you put it needs to be level.  I did use some wooden pallets but...would be nice to have some sort of floor.  Also, the only directions provided are pictures!  (No words)  Easy enough to follow but would help.  Also, the wood is pine and a little flimsy when the 2 nesting boxes are attached up high.  Sometimes there were pre-drilled holes and sometimes not...definitely use a cordless drill!  I think my cats will like it...they'll use a cat door to access it.  Here's pics of the beginning process - I'll add more later...almost done!