I have tried both Soundcore Air 2 and Soundcore 2 Pro. The Pro sounds great, and the hissing problem improved a lot in the iteration 2. However, the microphone audio quality is just awful. When I called Anker customer service the representative can barely hear me. The sound becomes robotic, metallic, with a lot of missing syllabus. The Soundcore Air 2 has the similar specification of the microphone, but it delivers much better call quality than the Pro! I wonder if this is some hardware issue that I have to wait another iteration or the firmware update may sort this out?
I know this is not a quality fluctuation. I heard the audio in YouTube channel reviews and the records off my two pair Pros (iteration 1 and iteration 2). They are all bad. I can confirm that in quite place the quality will improve a little but in normal office noise level the calling with this earbuds is impossible.
If necessary, I can upload some audio record samples to demonstrate this issue.