I checked out the GMA340. It seems to work just fine.
I did notice a 1 Hz clicking in the headset. I tracked this down to the ADS-B system. I suspect that it is an inadequate ground on the ADSB. They use dual 18ga wire - I had a single.
I struggled a bit getting my PC to talk to the NavwWorx. The output as intermittent. I think it was dues to the UAT antenna being near the PC. The PC eventually froze. I moved the antenna and rebooted. Everything worked pretty well.
I did get stuck on the NavWorx setup. They have a Set Protocol with a lot of values that don't make much sense to me. I have to reread that section of the manual.
I moved to configuring the GNS430. I was able to get GPS data from the Garmin over to the GRT. The biggest problem in interfacing is the various vendors use different terminology for the same function.