I tried ditching a number of years ago in a helicopter, and believe me it seriously sucked.
We went from big twin engine IFR fully auto-piloted helicopter to a full on survival fight in a very short time.
By far the biggest shock was that we rolled on impact, the aircraft filled in seconds and the temperature was horrendous. I remember hanging upside down in my seat, desperately trying not to gasp in the cold shock at the same time as trying to get my emergency exit to work. It didn't and I went out through one of the other exits. Everyone on board had some problems with hypothermia before were were picked up, and it was August.
Despite all the annual training and preparation all the drills went straight to rat s###. I regularly read theories on here from people who have either never tried ditching, or think they know how it will go. Go get some proper training, you should never need it, but if you do it will be worth every penny.
SND