Had full access to one for several weeks. Never did see any practical applications. Still have access, but don't see any reason to go back. Spend your money as you see fit, but I think it's wasted money.
I sew my loops with a simple cross stitch, then sew them in however the regular stitch would fall. I can generally angle the needle after it's through. I frequently help the process with liberal use of 'Carpenter Words'! And I don't mean square, level or plumb.
I work construction, mostly road work now, but years of home building also. Obenauf's has been my go-to for the last 15+ years. Twice a week I treat my boots and they're good for the duration. GOOD stuff!