I have a friend that worked and trained for Ackermans for years (I actually just saw some pictures of her on their website xD), and got the priveledge of going out there for 'the tour.' While not all of their studs should have been studs (I didnt particularly like Black Hawk or their cremello stud) theres no doubt they had some quality horses and they all had great temperments and seemed very gentlemanly. Pretty facility too. At that time they had just started DunIt under saddle. He was superb!
Not sure I'd personally breed to one of their stallions, but I've seen a lot worse and ALL of their horses were in great condition, so I really can't bash them.