The APA bandsaw guide is guiding the saw blade without friction in the cutting area above and below the saw table.
No friction means no heating, no heating means no wrong tensions within the blade which means less blade fractures and a smoothly running saw blade.

The PANHANS program includes machines with wheel diameter 400 900 mm.

Of course they have a solid steel construction and of course cast-iron saw tables and bandsaw wheels just like one would expect from a bandsaw machine that should last many years