I have 2 senior cats and I buy them a cat tree almost every year - they love them!  This Bybee Cat Tree is Awesome!  It came with actual written instructions in a booklet and it only took me about 40 minutes to put it together.  This was the easiest ever and I have had some doozys to do thru out the years!  I love it, the cats love it and I hope they continue to be available in the years to come!  By the way the base is big enough and heavy enough that I don't have to worry about it falling over with the cats playing on it!