Same here using .4 and IOS ver 4.04 and I am not moving.
New features after .400 are:
Audio Recording: Don't need that but if I did I can just use the phones built in audio recorder and add sound track in post production.
Dual Remotes: A feature I do like and would love to have, but the
goggles are what I am more interested in.
Find Me: This one I don't even understand! You can do the same thing by bringing the Map in the main screen and walking to the drone. I guess they needed to repackage it.
Fixed Wing Mode: NO THANK YOU! I learned from my RC days that the worst thing you can do is mess around with the default stick commands. It always ends in tears! Also why do I want my drone flying like a RC piper cub with a camera on it?
NFZ Fixes: No thanks, my Mavic has not shown an NFZ message since I went back to .400 and I love the fact that when I drive out to new location I don't have to worry about if my drone is going to take off or not.
Signal Improvements:
Yeah it's improved (NOT)
Optimizations: Ok if they say so. My RTH, Gimbal Calibration and Hovering have always been perfect.
If you need the above then go for it. I only wish I had stayed back at .0300 before they messed up D-Log in .400. Now I find the D-Log Dynamic Range to be further compressed to the point of being useless. If your a D-Log user you have notice that DJI has not even released a LUT file for the new D-Log. They know it got ruined.
At least ART is back, so that is what I use.
Rob