Hiya c...dragon. That was I that posted the Serratus PFD. Serratus, who also mad e a line of backpacks, went out of business in 2005. I purchased my PFD from Mountain Equipment Co-op (sort of the Canadian version of REI) in the spring of 2005. I was in the market for a new PFD for kayaking, and MEC had the Serratus Flak Jacket on sale. I was actually looking for a rescue-type PFD that I could use with our fire department as well as for kayaking, but found the rescue-specific PFDs to be too expensive. The Serratus was a lot more affordable, and could be fitted with a quick-release belt for rescue application if needed. I also wanted something that had capabilities of carrying some extra gear. The Serratus Flak Jacket was the only PFD I knew of at the time that had the option of a adding a rear pouch for storage or hydration system.
But as Codger mentioned, the PFD thing is like the backpack thing - it has a lot to do with personal preference and fit. When I bought my PFD, Serratus had a really good sizing chart that helped my determine which size PFD to get. I was a little apprehensive ordering the PFD online, especially since it was an International order, but the PFD was dead-nuts on spec as stated in the sizing chart, and it fit great. Maybe I got lucky.
I also looked at Stohlquist, Kokatat, and another brand that I can't remember off hand. Kokatat does offer a couple different add-on pocket options for their PFDs.
Back fo the Flak Jacket:
Front and contents of back pocket:
A final thought: When I bought the Flak Jacket, there was a navy blue color option available. There was also a Black PFD of another brand that I was considering at the time, too. After a little thought, I felt that a dark colored PFD may add a step backwards as far as safety was concerned. Dark colors tend to be less visible on and in the water. If something bad was to happen to me, I figured a brighter color would help me get attention easier or be seen better. Of be located and recovered sooner. Good luck with your vest quest!