Tried this ES9038Q2M for testing. For the relatively small price paid for this board, you get a very good DAC. Tested with a single rail 15V supply and connected Raspberry Pi 3B+ (over I2S) with separate 5V SM supply. Using piCorePlayer 4.1 (I-Sabre-ES9023 DAC, native/DoP DSD Squeezelite binary, card control: 384k) the sound is amazingly clear and distinct and the bass is well-balanced. You can pin-point the instruments in a symphony orchestra. Was able to play DSD128 files (DoP) without any problems.
The board comes with a 5532D opamp. Looking forward to testing the board with a Muses opamp and a dual rail 15V linear PSU.