If you dive in cold water you should really think about a redundant air supply. If you have a freeflow and switch to your buddy's octo he can end up with a freeflow as well.
Here is a little rant I provided in another pony thread:
http://www.scubaboard.com/forums/2603184-post140.html
Here is a little rant I provided in another pony thread:
http://www.scubaboard.com/forums/2603184-post140.html