We were pleasantly surprised when our Ultimate Cat Scratcher Lounge arrived.  It is a great size and extremely substantial.  The only problem is all the cats want to get on at once and we have three that use it.  I guess we will have to order at least one more down the road.  They seem to use it more for a lounge than a scratcher; however, if one cat gets too comfortable, it gives another an opportunity to sneak up and knock him off.  I love the idea that when one side gets used up it can be turned over.  It doesn't shed like some of the previous scratchers we have purchased so it isn't so messy.  

Pros: No assembly required so that is nice.  It has the open ends and the cats peek through at each other sometimes.