[Update 29/03/07] Antifouling can be good in one area and terrible in another. Ask the locals with experience of the waters you are to sail in to get a fair reflection of the antifouling you need.
If you don't use your boat in heavy seas the likelyhood is that you'll get more growth taking hold.

'SEEMED AS GOOD AS ANY IN THE YARD AND BETTER THAN MANY.'

Strengths: Season:9 months on a swinging mooring in Portsmouths Fareham lake gloop and having done 1500nm, some of which was in heavy seas. After that time i was pleased to see about 50% of the 2 coats i had applied before going afloat was still there with less growth and barnacles than i expected. The pressure washer got rid of the obstinant stuff easily and a light rub down will see it ready for this springs application.

Overall: pleased!