Recently purchase the new Seahawk with 5th gen AIR2 to replace a ten year old Seahawk. Good redesign. Basic features retained, but BC is lighter and now comes with two tank straps. Do miss the handle on the backplate because the backplate no longer exists. 5th gen AIR2 functions well. 5th gen adds dive/predive, not that the 4th gen ever free flowed anyway...satisfied with acquisition.