Hey Frog,
I'm just going to add to the confusion here - see I agree to some extent with Tony that ponies belong on racetracks - but I alos think that Rick has a very valid point in backup with students...
My take on it:
I dive with peopel who would never get in the water without a pony and people who ould never consider bringing one...
Some of the reasons given to ring one:
extra safety precaution - ok, piece of mind is one thing - but if you think your regs are going to fail you - get them serviced. And don't forget that if you are going deep - this piece of mind, may not be sufficient to get you up in a safe manner if you get an OOA incident.
Additional air for a troubled student:
This I consider a valid point, it should also be noted that these are likely pretty shallow dives, maybe not much deeper than 60- 70 fsw and in that case the pony would do what it needs.
The argument that one should not rely on more equipment but prepare accordingly:
This is where I land, I do not dive with a pony, my regs are well maintained and of a type that does not tend to freeze up, I also have them maintained on a regular basis so they work well.
Use for Deco stop:
Nope - I'm sorry, if you need a deco bottle - fine - but bring a deco bottle, not your day to day pony, that deco mix should be pretty specific to the depth your are going to (and I think that if we caounted the votes of the peopel who dive Deco - you would likely see pretty similar opinions on using redundant doubles for back gas and deco bottles for specific stops... This is not an application for a pony bottle.
So how did I get on my high horse?
Well, I spent 5 years rescuing idiots out of the backcountry, these were people who figured that if I bring a cell phone to a remote area - I'll be fine - well, for one thing there are no cell towers, secondly, bringing th e cell phone was a very poor excuse for not making sure that you are properly trained and have the right equipment.
I think there is a good reason to think that peopel with Pony bottles may get lulled into a similar false sense of security - and since I'm a trained rescuer - wanna guess who get to haul your ass out of the water, now go think about wether that is what I consider a good day of diving!
So - the end of my soap box stay - Do what you feel comfortable with - but make damn sure you are not just counting on that pony to safe your life - what if you forget to get it filled?
And I did not mean to imply that anyone here are unsafe idiots with ponies - that was just the level of intellect I found with a lot peopel I have picked off mountains in my day.
I firmly believe that the people here have a better level of knowledge and are seeking better information and that your personal way of doing things is equal to or better than mine - I'm here to learn and share my opinions.
Dane (the wet one)
Phew - anyone need a soapbox?