Bought the second camera, mainly for the extra battery, which came in handy on our last ride. Unfortunately, the case for the cheaper camera doesn’t fit on the Gold model, so I’ve hesitated to drill the case on the higher end camera.
Got a chest harness for my camera. I like the perspective of the chest mount, but adjusting it for the ideal angle is tricky. On the first ride I had it adjusted sitting upright in the saddle. When I stood up and leaned over the bars for rough terrain, jumps, drops, etc., the camera pointed down at the bike. On the next ride, I tried for the happy medium between the two. Of course, if you use a gyro gimbal, you can keep the camera pointed anywhere you want.
My thinking is that the chest harness is probably best for riding solo, while the helmet cam is best for following other people, depending of course on what you’re trying to shoot. When solo, seeing hands on the handlebar using the chest mount provides some interest, but you can track someone better down the trail with a helmet mount - with the chest mount they may ride out of the camera’s field of view unless you rotate your body to try to keep them in view.