Not familiar with the DZ at Raeford, but the tunnel is pretty nice. I say go for it! I've got 6 AFF jumps and 25 minutes in the tunnel, and while its hard to tell where i'd be without the tunnel, I really doubt i'd be as comfortable as I am now. Just did 10 minutes last night.. My up/down, forward/backward, and arm turns felt solid and all around controlled. Worked on leg turns and side slides for the first time, they were sketchy but.. existent . Just being able to maneuver myself where I wanted/when I wanted was great. And not bouncing off the net/walls like a pinball machine is nice :)
Go for it, if you're like me you love to learn.. And there's a wholllllle lot to learn