Zebra's actually are wild, that's were they belong, but just like horses, if trained right, they can become really good rides.
My friend has a 10 year old zebra that I ride every now and then... She found him abandoned at the side of the rode as a colt, they think he fell out of a transportation truck that had gone by earlier in the day with his herd, and it hadn't been noticed. Poor guy
But he's happy, he's a cute little mover, and she wanted to show him, but here with all the illness's going around lately it hasn't been allowed yet.
Also (and I don't know if it's the same over there as it is here, so I apologise if it doesn't apply), you actually aren't allowed to kind of just own one, you need to alert a national park office, and inform them of the zebra, and your intent to keep it as a riding animal/pet, and they come out and check your facilities and things like that, and there's a hang of a lot of paperwork to fill in
But I think they are awesome to ride, and if I could, I'd get one. It's cute.