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Yes. It is about the best you can get. All the conditioners work well, the thing that makes Prime so good is that you only have to use a small amount (1ml/10g as compared to others at 5ml/10g) therefore you get more for your money. I have seen a conditioner marketed for ponds that uses even less but I can't remember the name.
Many people use Prime. It works very well, and like mentioned you need less. Stresscoat works very well also, but need to use more during WC's. I personally like Prime better.
Once I switched to prime I never bought any other conditioner. The others just get so expensive when you have to use so much every time you do a water change.