Anybody used Waveshare AD keypad?

This looks like a good buy.

Wondered if anyone has used it? The 16 buttons are 0.3 volts apart on one analog pin- thought I'd check to see if the buttons can reliably be detected.

Yes sir, I've been tested once. It reads Ko to K11. I put AD input pin to Arduino analog A0 channel. I found just K0 to K11 buttons work only.Whenever K11 to K15, I saw the AD_value 1023 . That's all.