I personally wouldn't scub a dive in 20fsw for lac of a spair 2nd stage but, thats just me.
Just to put in my 2 cents - by the way, msscuba, thanks for the credit as "VERY" experienced but I think that's debatable
At any rate, our max depth on that one was 15', and with two buddies I didn't consider this much of a risk. We ran about 300 psi dealing with the freeflow, and then I managed to get it stopped. And it DID still work; but given its tendency to resume freeflowing when used, she used the octo and had the normal reg as a backup, should it have been needed. Remember, you CAN breathe from a freeflowing reg, should it be necessary.
Anyway, glad to see everyone's happy and I, for one, was impressed with the dive! Having attempted this dive repeatedly but scrubbed it each time for weather reasons, I was thrilled to get out there.
Happy diving!