our experience is similar to shoes. just at the level of the water is where our boat likes it.
we have had it come off once but the guy I got it from had it come off several times. told me when he gave it to me to paint it bright pink so it would stand out if it fell off but we haven't yet.
contemplating gsa but can't get past the silly price for it yet. it really should be at the 2-2500 pricepoint imo.