I used one for a while in the 1990's, mostly off Boston's Northshore. I liked it but not that much. I sold it to a guy who inspects industrial water towers and tanks. He used it with the communications set up.
- Plan for greater air consumption due to these types of masks; I think some if not all maintain positive air pressure;
- Always carry a regular scuba mask around your upper arm, like an armband; if as and when these masks fail you it must come off-so you now have no mask and no air; the back-up mask will be a great thing to have, along with your octo of course.
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