Yeah, it is pretty cool. :-) At level 30 you can buy a mount that adds 60% to your movement speed. At level 60 you can buy a mount that adds 100% to your movement speed. At level 70 you can buy a flying mount, that flies at 60% of your movement speed. Then, when you have the cash, you can buy a flying mount that adds 280% to your flying speed. Epic. :-)