I have about three or four dozen NuMasks, from samples and from various EMS Expositions. I use them when I get the chance to arrive on scene of a cardiopulmonary arrest, alone, and long before an ambulance. If it doesn't seal perfectly by itself, all you need is one hand. The BVM fits right in the tube, if the BVM has a handle, you're in business. They're so soft, you can yank it out, trauma free if they puke. But watch out, that thing is like a vomit nozzle. As for the little blue airway that comes with it? Throw it away. Use a standard OPA, I use Hudson Lifesaver Tubes - but replace them, not reuse them - and haven't have too many problems since I got the knack of using the NuMask.
The founder/inventor and I developed a pretty good email thing. B/c I seen it in JEMS, called for a sample, used it.. Then he took a survey from me on it's use for EMS. It was developed as a hands free CPR Mask. My first gripe was that they had a great product, a few set backs, but nothing major; but the real test, would be to market it w/ a BVM w/ a handle.. Like an Ambu Spur; or the blue LSP Bag masks. So he kept sending me replacements whenever I sent an email that I used one, w/ the outcome stats, etc.. and I see now they sell them w/ BVM's. I'd just buy my own BVM and get the sample, IMO. I'd say, from a rural BLS point of view, however.. The time from the person being found, to access to the 911 system, to EMS arrival.. You're pretty much plant food. However, when I have been able to arrive quickly, with witnessed arrests, the patients color has always greatly improved with the NuMask, vs a standard mask. You get better tidal volume. I've used them about six or eight times now, one patient, a smidge under a century old-totally f**king serious. Resuscitated, BLS. That's pretty good, IMO, seeing as how about 9 out of 10 rural cardiac arrest victims are beyond help before the dispatcher even pushes the buttons.
These things are also the shit for single rescuer CPR in the ambulance. You get one in, hook up one of THESE and snap it to like a scissor strap on your leg, and you can stand in one place the whole time w/o moving around to C cup the mask, and bag. Just get out the CPR board that prolly nobody uses anymore, to keep the airway open.