Another option for more dedicated cutting sheet goods is one of those almost vertical wall mounting types. I've not used one and don't know the good brands/models, but have heard positive reports - especially when floor space is limited. You tend to see them in B&Q and places like that.
On the low volume/less frequent end a Festool hand saw and one of their long guide rails is another route in, albeit you need the means to set up square corners and the like. You also need a large flat surface covered in a sheet of foam or a cutting frame, or lots of well placed support blocks to avoid issues with the weight of the cut away piece breaking off near the end of a cut.
It takes a good saw and blade combination, ideally with a close fitting throat plate (the Festool rail incorporates this function) to deliver splinter free cuts in ply.....