It looks great.  Is well built.  Hence the 4 stars.
The only downsize is  it viewed to me as if the lower platform stuck out more - making it easier for a geriatric cat to take two small leaps to get to the window sill.  That's why I loved the opening on the platforms too.  But unfortunately they are pretty much under one another, not providing the ease of access I was hoping for.
But the old one was beat, and she seems to like sleeping on the lower platform, so I'm keeping it.