The ES100 is well received as the best Bluetooth receiver with exquisite sound quality. ES100 has been on sale since early this year and is currently sold in the US / Europe / most Asian countries and is gaining popularity. Check out Amazon reviews and the Head-Fi community.
Amazon US review: https://www.amazon.com/dp/B078H4YD2L#customerReviews
Head-Fi EarStudio thread: https://www.head-fi.org/threads/radsone-earstudio.867366/