That's it! I couldn't think of the name. I think I even saw that they rent Bike Friday tandems.
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I suspect it's about much more than just wheel size. My BF Pocket Crusoe is a "petite" model (for riders < 125 lbs) so is one of the lightest ones they make (smaller diameter tubing), and I have drop bars so don't ride as upright as I would on a flat-bar folder. Ultegra in front, XT in the back for loaded touring. The fact that the componentry is better and it is much lighter weight than a Dahon would probably make it ride much better. I've never ridden any other folder besides my Friday, though.