I run 2 Penn 600's off of my boat, and I have fished as many as 3 lines off of a downrigeer, but usually only fish a single line off of each. I tried to run 5 lines off of the boat this summer, but the fish were so thick that I spent all of my time setting lines, so we switched to 3 max, one on each down rigger, and one out the back on the surface.

The Penn 600's have not failed me, yet, so I'll keep fishing them.