after having several variants of homemade rollers - from broomstick dowels to big (2.5" ?) PVC, I finally paid money for one last month. For $20 a Dick's, it's steel with neoprene handles (they may come off eventually). Quick loading pin is nice. The best feature? The area where the cord rolls is bound on either side with ring, to keep the cord away from your hands while you're rolling. It's worth it to me ust for that, to eliminate the diastraction of rolling up the cord without running out of space.
I will say that the homemade PVC has an advantage in that you can put it over a straight bar on a rack or cage, so you ca concentrate on rolling instead of holding the thing out from your body. If you have a power cage, you can put a straight bar through it at the right hight and leave it there permanently.