Many of the sexiest upgrades apply to Flex Radios equipped with the optional 2nd receiver which I don't have. The benefit for the company is they'll sell a lot more second receivers at about $700 each.
They would sell many, many more of their radios, especially the 5KA and RX2 combo, if they pulled their fingers out and commissioned someone like Beppe (IK3VIG) of Woodbox Radio fame to sort out the GUI mess (pun intended) and drag it into the 21st century. Getting their radios to fly on all engines (2 or 4) would also work wonders for sales.
Performance, flexibility and STYLE...an unbeatable combination!!