One problem with the Aerial Beast Infantry (The guys on Branths) is that heavy armor they wear, a bit odd for guys riding around on flying lizards who you assume would want to be as light as possible plus it means they lose a point of MP, meaning they can't hit 7 MP with fast movement for that +3 to-hit modifier (Coupled with their VTOL movement mode and squad deployment that's a total of +5 to-hit)