It has been my experience in other business fields that brands that have loose distribution policies tend to get knocked by certain retailers regardless of the product’s intrinsic quality.
Siemens will sell their aids to almost any dealer…even Ebay merchants.
Hence, audiologists and dispensers that wish (or need) to maintain high gross profit margins will shun those brands that fail to protect them by widely distributing their products to dealers who do not want (or need) those high gross profit margins.
My personal experience is that Siemens builds high quality products fully the equal of the best available from the other manufacturers.
Perhaps, we should examine the underlying motivations of those who knock a widely accepted brand. And also be aware of the emotional bias of those that tout a brand they own and like. (= I bought it, I like it, my sense of personal self worth and judgment is wrapped up in this purchase.)
Unfortunately there is no objective unbiased system of testing hearing aids available. No Consumer’s Report Magazine. Ed