I've used them for years. IMO, the key is to also tie the boat off correctly to the dock.
The whips keep the boat pushed out and away from the dock but don't do well keeping the boat from moving forward and back.
I always tie a line from a cleat on the dock near the bow, to the stern cleat on the boat. Then cross another line from the stern dock cleat to the bow boat cleat.
This keeps the boat from moving forward and back and allows you to easily pull the boat in to get on and off while the whips are still connected.
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