Would not disagree with above. However, there are a lot of horror stories around this place from the good old days. Meanwhile there are several boats picking you up when you have a problem. Just check the flag on the point and dont go out if its red. That means the boats cannot go out of the channel. At least it will be expensive. And of course, Manawa and one eye can be pretty big waves... so its not the wave to start with. But the nice thing on the island is that there are smaller waves just a few hundred meter away for those ones who start with waves.
Here is an overview of the waves: