only one issue with hydrostatic, if it does get activated after falling in, it is advised not to change the firing system without doing a 24 hr, inflation test afterwards.
So unless you wang to keep fully inflated jacket till you get home, you best carrying a spare.
I have also heard the hydrostatic have inflated in yachts with a gust of wind!
SPRmarine / SPRtraining
RYA Training Courses & Safety Equipment Sales