I have a GMA 240 and wish I did not. As many others have found, my cell phone won't work with it. My Clarity headset does not work well but my Bose does. If I have a passenger headset pluged in the background noise with both mics open causes poor transmission. Having to adjust two volumes and squelch is inconvienient. And unlike many other suppliers, Garmin support is horrible. The PS Engineering in my past plane was a real delight.
