I have a 30 pound 2 year old Pug who is scared of stairs so this is going to take some training.  He sleeps with me and I am having surgery in two weeks so I wanted something so he can get up on the bed.I usually lift him up myself.   My only caution is it does slip.  I have hard wood floors and the small little dot sticker things it comes with to prevent slipping does not work.  I purchased a non slip bathroom mat and put it under it, and it works fine.  Easy to fold up and very lightweight.  

Pros: Easy to fold up, very lightweight.
Cons: Slips on hard floor, you have to purchase a non slip rug to put under it.