My previous PFD was overkill for the day paddling/overnight touring which I did with my sea kayak. The bulk was reassuring, but that bulk detracted from the comfort of paddling and from optimum flexibility when practicing various kayaking skills.
With the OSO, I can wear my PFD continuously with no fuss and practice rolls, towing, and rescues with ease.
In addition, the reduced bulk makes stowage easy when the PFD is not being worn.
A fine product for its intended usage.