I use a roll cast often, esp since I saw lefty give a demo on the roll cast, he pulled the tip of the line, up to the attachment to the leader, parallel to his position on the water, then performed the roll cast. He said " God wont let you roll cast with too much line out", I find a 9' rod, a dt line, and how good my timing is that day all add to how well I execute. A 4wt line works for me....Just my 2 cents