Those Honda twin "side by side" piston calipers are good for our old bikes because it's hard (but not necessarily impossible) to mount decent modern 2 or 4 (or even 6) piston opposed piston calipers due to the narrower clearances between forks/discs/wheel etc, these modern brakes of course are "state of the art" compared to the ol' single puck calipers that came with our bikes. Also, being a "bolt on" conversion, it's good for guys with no access to machine shops etc, and affordable too, as they're not really sought after items as such.
Having said all that, a well set up pair of F2 calipers feel like heaven on a stick compared to all the other horrible SOHC-4 brakes. My Suzy GS1000S has the same OEM calipers (Tokico supplied all the jap bike manufacturers) as my F2 and I've hauled it down from 145+ Mph speeds with confidance, and that's with the spongy old rubber brake lines. It's one of those things that has always felt so good, I just have never bothered changing them, they work, so they stay.
Well done Sean for bringing it to our attention mate, and good to see you're getting out on your "beast", too! It's supposed to rain here tomorrow, but if I can sneak out I'll try to get some miles under at least one of "the fleet", ha ha! Cheers, Terry.