Can anyone with a recent delivery comment on the model Garmin transponder supplied. My avionics shop tells me the GTX 320 is discontinued and worthless from a trade to the GTX 327. The GTX 320A however has the same insides as the GTX327 and brings a good price. I have position 170 and hope by then Cirrus will allow the upgrade. I currently use the GTX327 in my Commander and it is great. Comments?