I used one of these machines recently at a sewing event. It seemed very nice and had a really innovative needle threading system...push a button and this mechanism comes out of the machine, moves downward, threads the needle and then retracts back into the machine.
My only concern would be...I was unable to see how you would manually thread this machine if the auto system failed. That could mean a very expensive repair.
That would be a question to ask the Brother Dealer.