They are the same temperament-wise as horses and ponies. the main difference between them is theat donks' coats are not waterproof like a horses. they dont have the waterproof grease in it, so they absolutely need a shelter in their field.
Like you can see from the pic of the coloured stallion, my 5 year old sister rides him no problems. they are on a lead rein, but thats more to the fact of her inexperience. in fact, i've recently returned from spending the winter in Australia- when that pic was taken we were in the middle of a 4 hour ''trek''!-the first time he has had a saddle on in 5 months, and only about the sixth time since he was broke!
the only thing about horses is that they may have a smaller stride- i've not got any small horses to compare speeds!