What is it your looking to do? The only reason i would say to upgrade would be for more memory to run lua scripts other than that your not going to see any difference with a rover when it comes to better sensors as IMU and barometers arent really used.
I like the redundant sensors and I have been having many issues with my current pixhawk 2.4.8. Mainly having difficulty calibrating accelerometer and compass every single deployment and getting errors in the middle of missions.
I do have some lua scripts I am running as well.
I do not want to calibrate every time.
(almost) every time I power up I get gyro errors, EKF errors, or compass calibration errors. This can be extremely difficult to do because I often will deploy my autonomous boat while I am on a vessel and I cannot exactly keep everything flat and still doing an accelerometer calibration while bobbing up and down on a vessel.
Maybe by 2.4.8 is a lemon but it is becoming extremely frustrating, hence the need to upgrade to something better.