Seanol is not the brand of ecklonia kava you want. The actual one you want to use is made by Marine Technology Corporation.I used Seanol a couple times. Honestly I was a bit disappointed. I measured blood glucose and kept an eye on body comp + training performance and didn't note a ton. I was taking 1200mg a day.
I think the research still looks pretty interesting so I wouldn't dissuade anyone from trying, it just didn't seem to be worth the price for me personally. If it was cheaper I'd give it a shot again and play around with how/when, but right now just not as feasible or worth it (again for me personally).
Check the above for a decent overview or you can find a decent bit of studies searching around.