Well, I received both the Bionix face shield (with anti-fog coating) and the CSUSA bubble shield last week and gave them a go. Here are my observations:
Bionix: I purchased on Amazon for $35.14 + tax. It feels sturdy, has an adjustable headband , and the visor will adjust easily with several "stops" that allow it to be raised out of the way. The headband is reasonable comfortable, although I had to make some alterations to fit my pea-sized head. I attached a few bike helmet pads with velcro to make the fit "just right". The headband is adjusted by pushing in on the knob on the back and twisting, making adjustments very easy. It seems to provide full face and neck protection, and vision through the shield is unobstructed. The face shield feels fairly thin and flimsy as compared to the bubble visor and has a listed ANSI rating of Z87+. With the added support provided by the frame around the shield, I am comfortable with the protection it seems to provide. I liked it a lot.
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Bionix
Bubble Visor from CSUSA: I purchased from Craft Supplies for $44.75 + tax. It feels sturdy, as well. The visor feels particularly sturdy compared to the Bionix and PROBABLY provides superior protection from flying objects. The ANSI rating is Z87.1 . There is not a frame surrounding the shield, but the shield seems to provide excellent protection. I found that the bubble shape of the shield caused a lot of reflection or glare with the lighting in my shop. This was not a deal-buster, and I may have become accustomed to it in time. The headband was not as nice as the Bionix. Whereas the headband adjustment knob on the Bionix, when depressed, allows a smooth, infinite adjustment, the knob on the Bubble Shield was a ratcheting adjustment and was much more difficult to adjust. I felt like I was going to twist the head band off of my head when trying to tighten the knob. The visor lifts up out of the way, but there are no "stops", as on the Bionix. I didn't see this as a problem, as the shield stayed up and out of the way. However, the shield had no "stop" in the downward position, and, in theory, could push down far enough to hit the neck. I felt like it provided full face and neck protection. If I were to keep the Bubble Visor, I would have to make similar adjustments to make a comfortable fit (pea-head). One additional observation is that the headband had an extra latch on each side, as if it were made for a different visor. Just an observation - not a performance issue.
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Bubble Shield
Overall, I felt like both face shields would provide excellent protection for typical lathe use. As for protection from large objects, who knows? Although the visor on the Bubble Shield felt more sturdy, that was it's only potential advantage. The headband, in my opinion, is far inferior and is a deal-breaker for me. Both headbands were too round for my head. My head is not a sphere. So, in order to snug the sides of the headband against the sides of my head, I would have to tighten both until they were uncomfortable and would apply too much pressure on the front and back of my head. Since I will be keeping the Bionix, I added the cushions as previously mentioned.
Bonus review: The face shield that I have been using is from HF and made by SAS. The visor needs to be replaced because of a build-up of gunk over the past year or so. That is what led me to look at the other options. It has a visor that feels more sturdy than the Bionix - more like the Bubble Shield. Now that I have tried the others, I have come to realize how comfortable the old one was. The headband adjustment is similar to the Bionix, which I like. It is not round like the others but is head-shaped and much more comfortable. The visor has a rating of Z87.1, as does the Bubble. The visor adjustment does not have the "stops" like the Bionix does, but it stays up out of the way and has one "stop" when the visor is lowered, so it will not hit the neck. One additional benefit of the HF face shield is that it cost $14.
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Harbor freight face shield
If you are in the market for a face shield, my recommendation would be to purchase the HF shield. Coming in second in line would be the Bionix. I would not recommend the Bubble Shield simply because of the inferior and uncomfortable head band.