After all that, I'm finding the Removu S1 to be really really good. So I'm a satisfied customer.
In the end I would have been thrilled to have a truly waterproof unit. This, like a few others, is spalshproof/rainproof. Not that I've had any problems whatsoever, but eventually I'll have it on front of my kayak in saltwater environment, so don't know how well it will handle that.
I know that it's quite a difficult thing to make one of these truly dunkproof, much less in salt water, and that adds to the expense. i would have paid the extra for that capability, though. So far it appears no manufacturer has bothered.
Only other thing I would have wished for would have been an on/off button on the handle for the Gopro functioning itself. S1 doesn't have that, and I see almost no one but Gopro Karma does. I have a remote and a Removu P1, so I can fix that issue, but it would have been best not to have to take your eyes off the subject nor put your hands onto the moving camera on the gimbal when flicking the filming on/off switch.