Review of ZipWall Barrier System
It certainly works, and works well. The materials are high-quality and well-designed. For a small space, you could get by with just two poles, one at each end. That's the minimum. A third pole at center improves things. But you're still not going to get a perfect seal. And drywall dust--my mortal enemy--seems to be able to infiltrate through the tiniest cracks and holes.
The Bottom Line
If you're on a budget, start with a couple of poles to get your feet wet. Rather than buying the special side clamps, it's possible--though not wonderful--to improvise by tucking the sheet plastic between the pole and the wall. Along the ceiling, you can pull the plastic taut between the poles rather than buying the foam rails. Though not perfect, it's a far sight better than the staple-and-tape method.
I'd say that even if you're on a budget but anticipate a lot of renovation activity, spring for the whole system--clamps, rails, and all. Justify the cost on the grounds of saving yourself tons of future pain and misery. It'll help you concentrate on the real task of renovating.
What if you're not doing the work yourself but are hiring a contractor? I'd say if they show up with a ZipWall and set it up in your house, they're a keeper.