Thanks! I have very few rounds through them, but my perpetual problem with bullpups is the way they balance. That rearward bias isn't "normal". I suspect a vertical foregrip could help on the RDB but I don't know if it would work with the -S.
I'm this close to ordering a Trek-22 10/22 chassis and it has a similar grip angle to the -S so I think they would pair well on range trips. OTOH the RDB is only $20 more than the -S through my local pusher and might be more versatile. No idea what extra versatility it might have or why I'd need it but that's how my brain works.
The RDB-S is very easy to toss in a sleeve or other slim case.. easy to store and stow away. Pretty darn light, too.