Agreed on the truce SfS

On temperament, an animals an animal everyones got a different personality; I found that keeping good contact through growth helps temperament: Some will agree on the temperament as good others will say bad and all from experience: My experience of them is quite docial if I'm honest; An exception here! If their in calf, them watch your back, they can be rather intolerant with all the hormones flying around.
Best suggestion I can make is find someone close by who has Dexter's, pay a visit, ask questions and make your judgment.
Meat to sell or meat to eat?
Butchery cost is a good point, however the butcher here does allow for size, but that wont be the case everyware. If your breeding to sell; in most cases the meat price will out weight the butchery costs, if its for your freezer, well personal choice, less meat costing more, but fine meat.
If I have cattle again Dexter's are and will be at the top of my list, its fair to say my main reason is space for me.