Off Topic!!
Just curious, not looking to get flamed, although I am a little jealous of those that have gotten Pugged =-)
How many have actually filled and breathed (<- is that correct?) down a spare air? Or are most of the posts regarding the spare air just plugging in the numbers?
The reason I asked is that I bought one (have not actually been under water with it yet) for use when installing my docks. ( I need a minute or so under water to adjust the legs). I have a Pony for back-up.
Anyway, while garage diving

last night I filled the unit a couple of times and breathed it down to empty. I have to tell you it took quite a while, a lot longer than I would have expected and although I did not count the breaths or time it, it was long enough to get bored with it. The first time I tried it I kept hitting the purge and checking the unit as it seemed like it was never going to run out.
I will be the first to admit that I know little about the math to figure out how long air lasts at depth but it seems to me that at 50' deep there would be enough air to do at "least" a controlled ascent and possibly if your not to paniced and you can control a very slow breathing rate you could get a bit of the 3 min. safety stop in also.
Of course this is all academic if like Uncle Pug it just plain doesn't work when needed.
Scott
Disclaimer: I only recently received my C-Card and openly admit I am an idiot.