I had been on Oct 2016 version for a while now with no issues until I had a little crash yesterday. Didn't hurt the bird much but all the sudden it didn't matter what I done it wouldn't recognize the aircraft firmware. I got on here and the dji forum and everything that was suggested wouldn't fix the problem.
So, I started researching and refreshing my memory on the right order to update, (depending on whether or not you use the tablet or DJI assistant 2) and finally decided to give it a try after exhausting all other options. I was afraid to fly if the app didn't know which firmware the aircraft was using. I was afraid it could lead to much bigger problems.
That being said, everything went Great!! One thing that was a little hard to get going after updating was getting a video feed. I followed instructions to a tee but had to reboot everything a few times, sign in and out of the Go4 app.. finally hit the right combination I guess and everything works like it should with no restrictions.
I absolutely love the new functions in Go4. As said above, tripod is Great for the type of flying I do.
IMO, Like others have already said, if you're satisfied as is and nothing is going wrong, nothing wrong with staying on your current version. I will say though that the new features is well worth it. Your choice. Just research if you decide to upgrade, follow instructions, and you'll be just fine.