Originally Posted by
t00lmanii
yes, there is a big difference between cheaper versions and the more expensive. Cheapest are the ones that you have to manually pull a cord to inflate them.......wouldn't do you any good if you were knocked unconscience. Next are the ones that will auto-inflate, but do so by having a "paper" disk get waterlogged. By the disk getting waterlogged it is soft enough for the penetrator to punch through to puncture the cartridge, thus inflating. These will also have a manual pull cord. The higher end models have a hydrostatic controlled inflator. The Mustang that I have has to have the hydrostatic sensor 4 inches under water before it auto-inflates. That precludes it from inflating from heavy rain or water splashing on it.
Now....about youth models......I don't think they exist. ALL of the auto-inflators that I have seen state that they are ONLY for individual over 80 lbs. I might also add that the auto-inflators are for swimmers only. They are NOT recommeded for non-swimmers. I believe that is because there is the possibility that the mechanical device that inflates them COULD malfunction, leaving the person overboard with the responsibility of manually deploying the vest.
Also, as has been said, they do have a shelf life. Normally it is 3 years, and at that time will need to be serviced by you. Rearming kits and individual cylinders are available for servicing. I believe the expense is worth it. I used to be one of those guys that only had my vest on while underway. Not so anymore, with the comfort of the auto-inflator I have it on from boat launch till end of day. You won't know you are wearing it.