If you are currently running without issues, there is no compelling reason to upgrade to a later 2.x build unless you need:
Revitalize Your Drive: Everything New in R-Link 2 Version 9.0.35.50x
One of the main complaints about early R-Link 2 units was "lag." Version 9 includes significant optimization of the user interface. Scrolling through menus, switching between radio and navigation, and responding to touch inputs feel noticeably snappier compared to older firmware branches. 3. Improved Bluetooth and Smartphone Compatibility