I have extremely limited experience with this breed, as as such I don't think my two cents is probably a true representative of the breed. But seeing as you haven't had any other replies: temperament wise the bulls I have handled can be a little fiery - but as I say my experience is limited to one breeder. Other than that I know they have worked successfully in crossbreeding operations here as a terminal cross. As a purebred they can be difficult to fatten. They are one of the breeds that I kinda like the look of, but have never really gotten the opportunity to pursue the interest.
Good luck with them and hopefully some others can add their opinions.