The A20 is a
lot better than the X for attenuation. You will think your engine has been replaced with a PT6
The mike and speech clarity are about the same; in fact I would say the mike is slightly more position-critical than on the X. The mike itself appears identical.
The X is no longer made so there is no extra cost as such. The A20 sells for £995 in the USA, and some firms do a $400 trade-in, as I posted on the other thread.
I did not buy the bluetooth version because it is IMHO useless** in Europe, where most Tower/ATC numbers are top secret
In the USA, you can use a phone to collect the departure clearance, etc.
** except if you have a bluetooth-equipped
satellite phone. I ground tested the Lightspeed Zulu with a Thuraya SG2520 satphone and it did work, but the quality was truly crap (which I am sure was down to the phone).