This is a great looking hood, love the slate color.  Been using it for about a month and am satisfied.  The installation of the hood itself was fairly easy.  
Installation on the chimney sections was very difficult.  The screws that hold the upper chimney section in place are extremely small and impossible to line up and drive home.  I ended up drilling out the wall brackets and bolting the upper chimney section in place on the brackets.  The lower chimney section fits very poorly where it meets the top of the hood.  There are two tiny little tabs that are supposed to hold the section in place but they are essentially useless.  The fit between the bottom of the lower chimney section and the top of the hood is very poor and it's impossible to keep the section in place.  Again, I ended up drilling and bolting the lower section in place.
I would give the hood 5 stars for appearance and performance, 0 stars for the poorly designed chimney section.