I recently purchased two cat trees from Wayfair for my cats in our new home.  One cat is a dainty little girl and the other a stray tomcat that we adopted who  is VERY active.  I purchased a smaller tree that has a cup on top that sits in the sunny bay window, a perfect place for a nap and then sisal poles to stretch on when she wakes  up.  The other is quite tall and the tomcat loves climbing and playing.  It shakes a little, he is quite hefty but he is fearless and loves the platforms and the house.  They were easy to assemble.  We are all happy with out cat furniture.... Judy - Bijou & Hawkeye