My elderly dog suddenly could not jump up onto my bed and I was not strong enough to lift her.  I took a chance and ordered the Pet Stairs.  I was amazed when they arrived.  No assembly required, just swing open the stairs from the standard part and it was ready for use.  Very light weight but totally steady so as not to alarm the pet. 
(I have a very wimpy dog)  At first she was terrified about it,  but with the temptation of  a few treats, she flew up those steps and was very pleased with herself.  As for me,  I am pleased with how nice they look in my room.