I have never owned one but I have ridden a few and they have been quite nice.
I broke and started training a PMU baby (paint/draft).
A woman I know absolutely adores them, she recently sold her shire/tb for $45,000, he was lovely to ride. She bought her foster daughter who is my best friend a hanoverian/shire who is beautiful but HUGE and she is 5'1" so she needs to get the ground training respect thing quickly because he could just run all over her.
Of course there is the other end of it. Another friend of mine bought a shire/ tb and it's completely mental. The mare kicked my friends mother multiple times while she was trying to catch it in the paddock. The poor woman got a concussion and a severely lacerated liver and is on bed rest for 3 months. The horse was sent to Charles Wilhelm who doesn't know how much he can do to change her because she is just looney, beautiful but looney.
Generally I think it's a good cross they make good event horses. They get the athletic ability of lighter breeds and good minds and sturdiness of the draft.