On the griffon my brother uses one all the time in his empire armies (he painted it above average too

), and it works very well for him.
IMO the
RBT are just not as useful as they once were, maybe drop 2x great eagles to up your
SM to 21 models? The seaguard models do look awesome but having just painted my own unit I will tell you they suck to paint

, useful model being fighty and shooty. Lastly, last month I won the local tournament at the
FLGS (2250) using Tyrion a Dragon Mage and Lore of Metal mage 60 spears in 3x20 and 2 units of 10
DP with standards. You just will eventually learn (if you don't already

) on how to use monstrous mounts, using cover or another unit to take the cannonball to the face. And sometimes you use the big beasty to pull or be cannon fodder for the
DP and
SM to get there.