Welcome to TTS!
Have not tried to call Edge in a while, so cannot help with that aspect. Companies are trying to get away from voice communications in favor of computer based response systems.
I used a CTS2 in the '99 Suburban and it worked fine. After a while, I ignored the dash gauge as the Edge was more accurate. Granted, this is no guarantee that the CTS3 will work in your vehicle though.
Recently installed a CTS3 in a '95 Ferd diesel and it read the PCM just fine. Only challenge I ran into was the initial handshake where the CTS3 could not read the VIN and I had to manually enter the information. Cannot necessarily blame the CTS3 as the '95 Ferd is OBDII compatible, not compliant.