I bought the Mustang Survival M.I.T. inflatable PFD (manual inflate version) to use during the heat of the summer. I use a conventional PFD for the rest of the year. I usually wear my PFD at all times but the summer months in Alabama prove to be too hot. I love the light weight of the inflatable PFD--you feel as if you are not wearing a PFD at all. I bought the manual version of the M.I.T. 100 as I didn't want the PFD to auto-inflate if it fell into the water.
The only negatives to this PFD (I kayak to fish!) is the absence any accessory points on the PFD. I would get use out of a knife attachment point, a pocket and a loop of some kind (for a zinger). These negatives are not deal breakers. I bought the M.I.T. on sale and it was a very good purchase for my needs.
Just note that an inflatable PFD must be worn at all times when on the water to be legal unlike a traditional PFD, which just must be present in the kayak when on the water.
