For all people who were out of luck in Classic World of Warcraft, or started with Burning Crusade there is a pretty nice exploit how you can farm this mount for the Feat of Strength.
All you need is 2 people, 1 healer and 2 damage dealer. Make a raid group, go into the Temple of Ahn'Qiraj and first kill the pat there. Then go for the 4 others. Kill 3 of them, and run out.
Important: Only kill 3 of them! Leave the last one alive!!
Once you're out of the instance, they will reset. Now you can go back inside, loot the dead 3 NPCs. In the meantime all 4 are respawned again. Kill 3 of them, run out and repeat until the Red Mount drops. With this trick you don't need to go with 20-30 people and clear the Temple of Ahn'Qiraji completely and you can kill apporximately 3 mobs/5 min with 2 people. In most cases it should take 1-2 hours until it drops, if you're luck earlier (when you're not lucky it may take many hours, but when it drops it's yours and you dont need to compete against 15-20 others)
Have fun exploiting