Yet, according to the current status of this poll, more than a fifth of ScubaBoard users use them, and about 55% either use them or have seen them in use.
My only point in this is a warning that ScubaBord poll results are quite famously not reflective of what goes on in the actual diving world.
1/5th of SB? Really? There are 35 votes in the poll. Do you think there are only 35 people on SB???
and, FWIW - options 3 & 4 should actually be "subsets" to 1 & 2, not stand alone data points...