I have 5 cats.  They are all rescues, all female and all elderly (10+).  I love them all dearly, so when I noticed they weren't jumping on the bed as often as in the past, I purchased these stairs.  The girls were beside themselves with happiness that they could once again gain access to the bed with ease!!  

Pros: Makes my kittehs very happy!
Cons: Stairs are a tad large and take up a bit of space.