I have an Ellisimo which is almost the same as the Brother 6000D. The Babylock comes with Nancy Zieman designs and the Brother with Disney. As to threading the needle if the threader breaks, it is not difficult to do at all. My threader works fine but it is plainly stated in the manual that the threader will not work with a size 60 or smaller needle. I just completed a quilt using monofilament thread which I always use a 60 needle on and the only problem with the threading is that I can't see that well anymore.
As to the machine itself, I would give up my new car before you could get this machine away from me! Well worth every penny I spent.