The RLD in Amsterdam is awful and full of scammers! While I was in Amsterdam, I also took a short trip to Haarlem, which is much smaller but perhaps better in terms of service.
However, if you want great service, you need to go to Frankfurt, Germany. The RLD of Frankfurt, while honestly disgusting at night, offers a far better value (generally 20 - 25 euros vs. 50 or more in Amsterdam) with seemingly far less scamming. The best of all would be the FKKs of Germany near Frankfurt such as Oase and Sharks.