I started out without, and had problems with the peep not rotating and sometimes blocking the view of my pins. That was on my OLD browning bow. I went to a tube and never had that problem...unless the tube broke which happens from time to time. When I got my bowtech, I originally went with a tube type peep. It worked, but tubes add noise and they do break occasionally. I'd keep the tube a little longer than it needed to be just so I could trim it back and fix it without replacing the whole thing. The last time I had my string changed though, I figured I've got this awesome Winner's Choice string, let me go without the tubing. I'll never use tubing again. No problems with nock rotation (I have the one that splits the string 3 ways too, whatever you call it.) It is always in position, never have to worry about breaking the tube, and the bow is quieter. Probably adds some speed too, but I've never checked.