Well I bought one and I have to say I like it a lot. It does cut very nice and so you get a cleaner cut and a better fit when you sew the pieces together. I did buy the board for the 21/2 strips. I think that is the one I wanted the most.
Yesterday I was short one strip so I cut it by hand and there is a slight difference in size' I think from the ruler to the cutter.
So all in all I am happy that I bought it.