I have the Shape Cut Plus and love it for cutting pieces that will be subcut. However (there's always a however), I find that sometimes my double folding of fabrics to allow cutting across the full width of the yardage sometimes has slight doglegs on the fold lines. So if I need to cut a piece that will be used in a border, I use a regular ruler and fold the fabric once - you know, the usual way with the selvages meeting.
However...I think the Shape Cut Pro would be a good tool for these longer cuts, even if the ruler would need to be moved for each cut. My reasoning is that sometimes my rotary cutter will slip slightly toward the end of the cut. As well, it would probably reduce the number of trims that I have to make to ensure that I haven't gone slightly off square.