I've made a few bargellos but never tried the tube method, or heard of it before now. On an easier pattern it does seem like it would make it easy. On some of the trickier patterns, though, I don't think it would save time. One pattern I did had me taking 2 or 3 rows apart, after sewing into rows, and then ripping them into partial rows and then sewing back together again so it would be like doing fabrics 1-2-1-2-3-4-5-1-2-3-6-7-8-9 and so on. It was just the challenge I needed for a summer project.