I have not used mine as much as I would like, but one thing it has been great for, English paper piecing the Hex's, I cut 2.5 strips then lay them across and cut 2.5 squares. Great time saver on all those squares. They may not be perfectly cut, but they work great for what I am using them for.
The 5" square is next on my buy list.
I have the drunkard path, and one or two for applique.