westcloud, you didn't mention if you are a man or a woman. Despite the current political/social atmosphere, it makes a difference in how things fit your body. However, though the Kokatat MsFit's name starts with Ms, it is a popular PFD for both sexes.
I have one and it works great. Here are some thoughts: several pockets have D-rings you can use to tether what goes in them. For example, I have a line on my VHF radio to the D-ring so it is not separated from the PFD unless I want it to be (I use a micro carabiner, small S-biner, or some other "clip" connecter. One issue with those radio pockets is they can be tight, and during the process of pushing a radio in, you can inadvertently change the channel you were set on. So learn where the lock/unlock function is on your radio.
When I started out, decades and decades ago, the word was to keep the PFD simple, extra pockets and such could catch on deck rigging. But, if you end up in the water, it's handy to have some things with you - like snack food, a radio, and some brand of Help beacon.
I bought the optional Hydration pocket that attaches to the back of the MsFIT. But I still prefer a water bottle I can store inside the kayak. I'm just fussy about the sip tube mouthpiece getting washed with seawater and so taking in a little seawater with each "first" sip. I suppose I could suck in some fresh water, rinse it around in my mouth (and mouthpiece), and then spit. But the other benefit of a separate water bottle is I can see how much is in it and better gauge my water intake.
Another issue is the hydration pack in the back. I've seen guides use it for first-aid supplies and other incidentals. Ironically, I don't recall ever seeing it used to actually carry a hydration bladder. BUT - using it for first-aid supplies assumes you can land and have access out of the boat, or you'll have an able-bodied paddler who can access the pouch while it's on your back. So, if you add that Hydration pocket, consider what goes in it.
For a while, I carried my Spot tracking/help device in it. Then I realized I couldn't reach the Help button. I also used it to carry spare batteries. Same problem - I have the items with me, but they are on my back, So I can't reach them unless I take off the PFD. And if I'm in a situation where I need those items, I'm in a situation where I definitely don't want to take off my PFD.
These days I carry spare batteries in a Ziploc bag in one of the PFD side pockets or in the upper arm pocket on my drysuit.