I don't personally use these as combat mounts. I use my griffin as my go-to tame mount. It can get you close to creatures so you and/or a friend can tranq it with darts. Excellent for search and rescue of your noob friend who is in a pinch and lost.
Wanna get Wyvern eggs? Use one of these with a whip and you'll get so many eggs you'll end up with so many omelettes that you don't know what to do with them
While diving pull up at the last second above your target and use main left click attack. Does a ton more dmg then just landing on target. Gives a nice speed boost too.