Just got a Ultra PFD and had my first downwinder during the week
Had no issues with restriction or hassles at all, I didnt even realise it was on as I was concentrating that hard on staying upright and trying to figure out downwinding

...A lot harder than I thought...
Theres no way I am going out kilometres off the beach without one, it also has a bladder so I have water available when I want it
Good product, its a "50" which is equivalent to a type 2 PFD so says the label