What is so good about donkeys, err just about everything. I don't actually own one, I share one, and since he has been here he has won me over, that and spending time with 3 that a friend owns.
They are great listeners, so calm and placid, very opinionated, out little guy is a mini donk, and he reminds me of a Jack Russell, in the way that he thinks he is around 17hh and the boss of everything.
The downside, I haven't found one yet, in less enlightened times they usedto blame donkeys for harbouring lung worm and giving them to horses, but that was just ignorance over worming. They are incredibly hardy, they cope with out dry cold really well, but I understand in damper climates *cough, the UK* you have to have decent shelter for them. A tree or high hedge gives shelter to a horse, but a donkey needs to be able to get into proper shelter. Not sure of the truth of that one, bust best to check it out.