I currently have the AZ09 paired with the ZSN Pro X and the sound quality is noticeably worse compared to wired ZSN Pro Xs. The biggest drawback with the AZ09 for me isn't the connectivity, which has been good up to 15 Meters for me, but rather the underlying incessant hissing whenever audio is being played. Based on various reviews on youtube comparing the two, it does look like the Qualcomm chip improves the overall sound, battery life and connection, but it has been noted that some of the IEMs still have hissing, while others do not. its a mixed bag but given the choice I'd opt for the Pros to have reduced/eliminated hissing, because it gets very annoying very fast.