These are top quality rod holders. If installed correctly, they stay put. I put a pair on my last boat 8 years ago and with minimal maintenance, they still loook like new. I took them off when I sold the boat and will use them on the new one. They'll probably outlive the boat.
I bought two for a boat on Long Island Sound. They may be expensive but they are strong heavy and durable. They will last for as long as the boat does. Installed easily and used constantly. They are much much better than any others I Looked at. They are pure quality.