If you have systems with mismatched capabilities (olde skoole iMacs or laptops with constrained disk speeds/bus bandwidth/RAM) you can farm out the heavy lifting to perhaps one capable machine (in my case as smokin’ hot Blue & White with a G4 upgrade — a sizzling 550 MHz) and have the port mechanism generate pkgs (.dmg, rpm, pkg and mpkg formats are all supported).
I could see this as useful in a lab or small office setup. I plan to make some use of it here.