The Seahawk bottom paint put on by the factory did not do the job well at all for us in the freshwater environment of the Columbia/Willamette Rivers (and and around Portland). We put on a different product early within the first year. After considering several recommendations by those with some good local knowledge, we went with Vivid Hydrocoat Eco, which is especially easy on the water, environmentally. It held up well for us. We have gotten some growth on the bottom, but most of it comes off right away with some cruising, and what little may remain doesn't cause any significant drag (based on RPM at WOT). We had a diver go down to knock off growth and replace zincs last fall, and he declared the bottom paint to be working well. Now, after two years, it is time for a renewal coat. Subject to inspection when we haul out, we plan to stick with it.
In the end, you have to pick a bottom paint based in large part on the water and conditions your boat spends the most time in. So check out local knowledge and experience. And my two-cents' worth is to go for an environmentally responsible option if local knowledge and experience suggests that it works well enough in those local conditions. Why not do the most we can to preserve the environment we buy our boats to enjoy? (This after being a devoted Interlux Micron CSC user in the salt water of the puget sound for many years, but that paint doesn't do the environment any favors).
Gini