I own one and love it for the fact, I can't get my machine threaded easily - the autothreader does not work, and my eyesight is another problem - and I even bought the needle threader - but if you can't see the hole in the needle, what good is the needle threader? :))
That said, I can set the bobbin winder to winding extra bobbins, while I sew - I have extra thread to do this with, and no need to stop sewing and will have my extra bobbin ready to go when I'm ready to put it in...
That is only my side of the story - but I do like it.