"I bought an X and it sounds really good"
This is a common assertion. It’s an opinion, which is perfectly fine.
The result will likely be questions.
On one end of the spectrum, if X = some well known amplifier, there are many facts out there in many places probably over a period of time that support the claim.
On the other end of the spectrum, if its a relatively unknown product with few or no facts out there to support the claim, be prepared for all kind of responses, including some very strong challenges. If you are not prepared to offer up some facts to support the case and respond to the challenge, best to just keep quiet. You have nothing more you can offer at that point. Trying to censure or silence the challenger will likely accomplish nothing for anybody. If they are being insulting or breaking forum rules, that’s a foul and its fair game to flag the response as such.
It’s just how things work.
Ridiculous assertions that someone is being ripped off or conned
How many times has this scenario played out here? Someone purchases product X, and tries it in their system. They report positive results, that it works as advertised, that they got their money’s worth, that they are happy with the purchase. Then someone, usually having zero experience with the product, replies with something like: “No, you’ve got it all wrong! You’re being ripped off! You’re being conned!
Does anyone else understand how ridiculous and absurd these kinds of assertions are?! The consumer who actually put up their own money and took the time to evaluate the product in their own home/system reports it works as advertised, they are happy with it, that they got their money’s worth. Then someone else claims they were ripped off?!
Imagine an agency investigating consumer fraud getting a complaint like this: “My neighbor is being ripped off!” “No, no, he thinks it’s great, does everything he expected it to. He’s very happy with it, but I just know he’s being conned!” Do you seriously think they’re going to open any kind of investigation into it?
You can disagree with what someone says about the effectiveness of a product all you want, but to say they have been defrauded, when they report the exact opposite, is patently ridiculous.