I just put Oarrights on my 10 foot cataract oars. It took me a half a day on the water to get use to them but after that they were great. I like them for all the traits mentioned above and I also like the extra leverage I get when I am rowing. Somebody mentioned that they make rowing louder, I don't agree. I think my boat is quieter with them on.
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Eat my oar spray.