The thread went off topic pretty quickly.
I remember reading about a Mustang PFD recall in the BoatUS magazine a while back so it would pay to check if you have one of these.
When I decided to purchase two inflatable PFDs for my wife and myself I did some research. Some inflatables are class III whether being worn or not, but others must be worn to meet the class III requirement. To me, that made a big difference because I can store the inflatables where they can be accessed quickly to meet the requirements and put the standard PHDs away and just pull them out when there are guests on the boat.
I forget what brand I ended up with but they are not Mustang. I didn't buy the auto inflating ones, I bought the ones with just the pull cord.