I once had an (Oz-made??) B&D 1/3 sheet version some 35 odd years ago. It has switchable modes between st'd orbital & linear and a dustbag. The "switch" was actually a lever on the side between the body & platen, and was only reachable with one's fingertips, and particularly stiff to move.
Trouble is, there wasn't actually much real difference between modes of operation. Sort of the difference between a true circular and elliptical orbits, but it was useful for window frames, muntins & stiles and the like that needed a more linear/less sideways motion.
I personally find Festo's Duplex sander's performance also rather underwhelming, but for different reasons. I've had a couple, now only one. For paint removal and other heavy duty applications I find it painfully slow, rather vibratory despite the contra-rotating counterweights, and unbearably prone to premature clogging and breakdown of the backing pad foam/s. For sanding of raw timber with finer grits it's probably OK, but realistically for my types of use it's just a ludicrously expensive and slower alternative to a shaped hand sanding pad used with painters' paper.