Very nice review! Clear and detailed. I feel like I know more about this dongle by reading your writing. Maybe I should keep my eyes open for a deal.

Thank you, I sent you a PM link to a really good direct/new seller. The M15 is a huge value.

Great review. While I use the Earmen Sparrow which uses the same ESS chip and Saber Pro chip, I can attest to the terrific sound of that chip combination. I'd love to see a shoot-out between the M15 (China) vs Sparrow (Europe).

Have you compared with the RU6 or BTR7 (over the 5)?

I have not! The M15 is such a strong performer it has ended my interest in trying other dongles. The BTR5 is outperformed so vastly it's barely mentionable.