The few times that i have been forced to wear a life jacket have resulted in...almost drowning by being hooked in and traped under the sail. I struggled to sink down enough to un hook the harness.The other... i couldn,t swim fast enough to catch the gear as it cart wheeled down wind, in the end i ditched the life jacket swam after the gear,got it and the life jacket washed ashore latter.
-Life jackets will keep you afloat
-They make it harder to swim quickly
-They won,t save you if you,re knocked out ,true for most vest style
-They can help with water starting,but so will a good technique
-Its easier to spot the gear in the water than a person
-They keep you warm when night sailing and the only time i use one