Sure do, Byron. Knotless tapered leaders can do just fine in many cases, but not always. Example: The butt diameters on most of the 9 foot commercial ones tend to be about .023-.024". That's just too big (stiff) for many of my fly lines, and causes hinging at the line portion of the line/leader junction. Also- I can build a leader of any length that I wish, not being limited to 7 1/2, 9 or 12 feet. And there are different tapers that can be tied also. I'm not knocking knotless leaders here. I often use them- but even then, I sometimes alter them a bit. Just my $0.02, I guess!

Chuck