Pros : More reliable and easier cutting. Now that I know how to use it can reliably cut to precise measurements.
Cons : The "stoppers" or whatever you call those things that keep the glass from slipping are not very easy to use. Once tightened down they can we hard to untighten and reposition. Sometimes they get stuck in the grooves.
Other Thoughts : The con is a minor inconvenience. The "system" takes a little time to get use to and understand how to cut to exact measurements, but is relatively easy to master.