Brush cutter question???

I'm sorry to keep starting new threads but I don't find answers to these questions. Now that I finally decided on what machine and got it delivered the search for a brush cutter starts. Would it be a waste to put a standard flow cutter on it since it has high flow available? I'm liking what I see and read about the Blue Diamond brush cutter which only requires 16gpm. It would cut probably anything I need and it is very reasonably priced compared especially to high flow units. I'm open to opinions, thanks.

Here is a link to the cutter I'm considering.

http://www.bluediamondattachments.co...-brush-cutter/

Brush cutter question???