I got a 7 and have never put it in the Karma. Took the 7 and the Karma grip on trip to Canadian Rockies and am convinced that I can now use the 7 without grip for great video and pics when traveling. That is why I got it. Am impressed with performance. Leaving 5 in the Karma, have old 3 that links to VTX and battery on my QAV-540G and newer cameras will not do that so sold my 4. I doubt the grip will see much if any use now.
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Been thinking about upgrading to the 7. One thing I worry about, is the lack of automatic horizon stabilization that I would get with the Grip. I have taken many videos where the 7 just isn't going to keep the horizon stable without the Grip. For example...you just can't do "jib shots" without the Grip. I suppose I could always put the 7 in the Grip if needed...but then...why upgrade? I also don't see any advantage in using the 7 in the Karma. Many of the upgrades are disabled when using the Grip or the Karma.
I can see definitely see the benefit of reduced weight in my camera bag... and mounting stabilized video on my bike or helmet would probably be easier than mounting the grip...even with the extension cord. I can also see the advantage of the stabilized FPV footage that can be achieved with the 7, and not achieved using the Grip.
I still haven't made up my mind about upgrading to the 7, but I am thinking about going with the Insta 360 One X instead. It solves some of my concerns about the 7, and also allows for over-capture and 360 VR video and photo content...but at the cost of some of the sharpness and resolution.