Major bummer about the horse is that it can never be endgame quality. I was assuming that any horse could be upgraded with 50 stat points, but some started with 25 in whatever stat just to help speed the process along... but nope, those 25 are on top of the 50 you can assign, so the imperial horse isn't even worth feeding, just save your money for endgame horse. :/
And the newbie horses are barely faster than sprinting on foot. Only thing that saves them currently is that they're bugged and can keep sprinting even with zero stamina.