Overall, a great cat tree.  The grey is a nice color and it's very sturdy.  Appearance-wise, the only con is that the top platform isn't carpeted on the bottom so you can see the brown base material.

One warning, this tree is better suited to small cats  The scratching areas are pretty short and there are some tight spots.  Unless you have a very small cat or one that prefers not to jump, I would recommend not installing the ramp and also forgoing the little circular bed on the 2nd from the top platform.  This makes a lot more room on the level and a place for your cat to jump on/off.  I ended up sticking the ramp piece on the 2nd from bottom platform to give more space (wedges in perfectly).

I am also considering wrapping more sisal around the posts so my cats can stretch out when scratching