Oh, this (my) answer comes a little late... . Ok, I have my Boss since End of May 2012. And I´m just in the learning courve. I´m sewing not too thick leathers, most 4 - 8 oz. After adjusting the bobbin tension and the top tensions it worket very well until jet. At the moment I´m taking the thread that was delivered with the Boss. And I´m looking for a Dealer here in Germany to by my threads.
So well, for the beginning an the end of the stich line i use two methods, once is to leave enough thread to stich back by hand or the second method is to do it like in the Tippmann Video.
greets