The idea is sound, but there are serious issues that have me on the edge of abandoning it. I've used it for 4-5 rounds so far.
The worst issue is that Arccos disables the use of wireless earbuds. I have earpods now, but I also used powerbeats 3 for one round. All audio output is diverted to phone speakers, EVEN THOUGH THE HEADPHONES ARE CONNECTED. I frankly can't believe Apple allowed Arccos into the store with this flaw. The play/pause function in the headphones works, but the audio only comes from the phone speakers.
Next, many strokes are not detected, especially putts. Putts are trivial to add or subtract, but regular strokes are not. The Editing function ballows you to edit the strokes on a hole, but it is poorly done. I am an iOS developer so I understand and can figure out a UI. This one is poor. One simple thing is that it prevents you from zooming in enough. This is a purely arbitrary and silly restriction.
Lastly, stats are not displayed well at all. There is not even a straightforward scorecard view of the round!!! The Golfshot app has a much better UI. The sensor functions paired with that app would be an almost ideal solution. I'm so close to going back to it. I actually spend more time editing each hole in this app than I do in entering my stats by hand in Golfshot.