you have to affix it to the wall for stability
935442
This is a great shelf unit.  I wish it were about 6" wider, but it works as is.  Maybe the company can make another shelf unit the same height yet slightly wider.  The one thing to know is the unit comes with a fastener so it can be bolted to the wall.  While not a crisis, it's being affixed with a zip tie so that makes it less classy looking.  Still, it's a great buy and looks very nice.
1627598
Serves its purpose I hung it on my wall with two command hooks instead of nailing it to the wall
898941
Use large screws with large heads.... I didnt, it fell off the wall and everything broke.
It was beautiful though.
1357649
Tricky application, not all of the pieces lined up.  Also, it fell off a normal textured wall two days after putting it up.  (If your wall is smooth you might be okay.)  We had to staple it to keep it from falling.
1698642
It took about an 1 1/2-2hours to put together. It looks great and gives a lot of space. It's a bit unsteady  so you defientely need to secure it to the wall.
Don't put the bottom stabilizer piece on until you secure it to the wall. Otherwise you will have to remove it and put it back on as we did.
4488946
PROS: Nice Size Nice Price
CONS: Can't re-position it if you want without part of wall coming off and you would need to own your own home to use this
With this in mind I did love this while I had it on my wall in my apt., but when moved noticed the issues and it went in the trash
This was not the fault of the company-I was looking for more of a decal, so I could re-position it or put it back up when I moved.
1856537
works fine, except the corner piece is gonna need glued. I'd be more worried if I had it hanging.
2672718
We ended up needing to cut a notch for the outlet and then also decided to anchor it to the studs on the bottom to make sure it does not accidentally fall off the wall.
4174060
It's fantastic except that it doesn't stick to the wall too well. I'll have to find something else to hang it up with besides what's sent with it.
1050225
Absolutely place it in a corner, no amount of anchoring on the base will make it less wobbly as you go up. We are getting L shaped brackets and wall anchors on the upper levels just to make it very stable. Thinker with it, make the design work with your space as most pieces are interchangeable.
I cannot stress enough how you can make this the dream cat hangout, drill holes as needed for the platforms to work if you are space constrained, do not hesitate to remove a module if they don't work with your room "flow" that being said, some pieces are non negotiable must go with original design it should be common sense as your putting it together. Now for the scores:

5 stars for feel and look
3 stars for stability
3.5 stars for materials, this is particle board it seems and thick cardboard for columns.
If your cats are overlords of destruction this will perish under their claws.

Anchor, Anchor, Stabilize this cat tree for a much happier kitten expierence
2744666
You have to be able to add the wall and phone connection pieces yourself.
2920279
Awesome thing to have, i just had a hard time getting it to stay on the wall the first couple of tries but overall great
3840364
If the wall is painted or textured you will need more than you think . If the surface is flat or drywall everything should be fine .
799517
actually built a platform on both sides of the stand and fastened it to the wall. Well made. Instructions were somewhat hard to understand. Actually built a much larger platform than the plans called for. You can load ballast beneath the stand to stabilize it.
2936665
We love the image, but we can't get it to stay stuck to the wall. It keeps wanting to roll up and begin to peel off. We took it off an outside wall thinking that might be the problem, but that hasn't changed anything. If it would stay attached, it would be wonderful.
1948101
This is really large, I was expecting it to be but some times you never can tell until you receive. We are using in the play room. Until we are secure about which wall we are rotating to wall using thumb tacks. It really is a nice piece but a lot of work for me to put up. If you are savvy with wall paper no problem for you.
I wish it was self adhesive.
We received discount for our review.
3963651
It doesn't come in a roll to lay out onto the wall. It comes in pieces and you have to let the artist take hold to get it together.