What exactly are you wanting to know? If theres anything I know about, its minis!
They ARE cheaper, though they still cost more to care for than dogs! We spend about $15 per month per mini, and that's for a mix of grass hay and alfalfa, then some all-purpose horse feed. They do tend to have more health problems because their organs are the side of a large horses though, so regular vet checks are a must. Founder is very common if you arent careful about their feed, and is often deadly as I'm sure you know. We allow our minis EXTREMELY limited grass, especially in the spring. Shodding is inexpensive usually and ofcourse, no shoes. As for the fence, everyones right. They are VERY smart! XD We have a four foot high wooden fence wtth three boards and chicken wire stretched tightly over the middle boards. You have to make sure that the lowest board is no more than a foot off of the ground too! Even with that though, our minis often escape somehow. (they're quite a hand with gate latches!) As for the mane and tail, that isnt too horrible hard to care for. I brush my filly's hair out completely once a week and do a bit of a detangle twice. That's about it ^_^ at the moment her tail drags two inches on the ground and her mane goes almost to her shoulders- and she' isnt even three years old!
(this picture was about five months ago ^_^ the tail is much longer now!)
It can be kinda hard to find a good farrier, but I guess that matters where you live. They need a fencing that doesn't have large gaps, (a have no idea how to explain this :) ) like the three rail type fences. And I think they can pull about there weight, I have two:). They are VERY good at getting out.