I put up 50 of them last year. I also put up 50 miracle tubes.
Miracle tube is a far superior product. No assembly. Ready to use. Reusable zip ties in place. Sturdy construction. But they are much more expensive!
Protex will require you drill holes through them to allow air circulation. You will then have to form the tube by hand and use your own zip ties in 3 places to keep the tube closed. Then use a couple more of your own ties to fasten to the stake.
My protex (4ftrs) have performed well. A few crumbled for whatever reason. They are in floodground and were covered 2X last spring. Most are just as upright as the day i installed them. Sometimes they "dent",but i dont see that as a terrible fault. All miracle tubes seem to have done great..
I have a few 3 foot protex out as an experiment on tiny pines. The small sizes did great. And pines survived in them!
I will buy more miracle tubes this year, but if $ was a major issue, id go with more protex. Maybe after 2 years of installation my opinion will change. But thats what ive experienced thus far.