Three things to remember about Bullpups.
1) They're heavy. Sure they look smaller than other weapons, but remember there's a longer barrel in there. But the balance is typically better.
2) Mag changes aren't "fast". You can get pretty quick with them with practice though.
3) LOUDER...sort of. The end of the barrel is now MUCH close to your face. Even if the sound levels were the same from a similar barrel sized weapon in a "normal" config versus a bullpup config, it's seems much louder to the shooter.
All that aside, go KT! Bring some new products to the table! I wish them success