Hi,
i've been using Game Golf but switched to Arccos when I bought a new Cobra driver (with the built-in sensor) 1.5 years ago and there was an offer to get the Arccos sensors for just the shipping price.
I can confirm the issues with the Arccos sensors, that other people reported. A few of them didn't even work right out of the box, shot detection was not consistent and the app just drained my phones battery to the point I had to carry a battery pack to even use it for 18 holes. So I got rid of Arccos, too.
I'm seriously considering building my own shot detection app. Can't be that hard. You can get a pack of 10 small NFC tags for under 10 Euros. And I have a programming background so want to try to create an Android app, where you tag your clubs with your phone similar to game golf classic/live. No cloud bs, just collect data locally, so no dependency on any company providing servers. I just need to find the time😄