Took a LONG time for my 5 year old persian to like it, but now that we adopted a 2 month old dosmetic kitten, my 5 year old - like to escape to the higher point and seem to appreciate being "safe" from the excessive play and teasing...and the little one does like the lower part. Well made...High quality. 
Note on the top portion...the cat can only see out of the "entry" corner...which has it's pro's and con's. Neither cat seems to use the scratchers at the higher levels.
Perfect-depending on needs.