I know they are a must and i know I need one. I am waiting on my Jackson CoosaFD and given my absolutely nonexistent knowledge of kayaks and what they entail I need some help. I have seen the seats for Jackson but have not really sat in one with a pfd. It seems that high backs are the way everyone goes. I tried on the Chinook fishing pfd and it just felt cumbersome. My wife has a s/m Astal 8 that I can squeeze into that feels a bit less cumbersome but I am not sure what the best is for fishing. Is there any specific things I should be looking for? Do I really need all the things the Chinook offers or should I look more for the astral?