The Rangecraft is a good bit of kit, but mine has been unreliable. Not in terms of velocity, or tracking shots - for that aspect it's fantastic and reliable. Arguable that's all it needs to be.
Occasionally though, it looses shot sessions, or I show up at home only to have a bunch of shot sessions with 0 shots. In this latter state, the device needs to be wiped to be usable. I just updated the firmware, but the firmware it has previously (which itself I had updated from when I purchased it) seemed to have a bug if you hit the 50 session limit and didn't notice, wiping all existing sessions out.
Also, there was no warning on the firmware update it would wipe stored data. It's the little UX things that set it apart from its more expensive peers.
I found the app experience lacking so I started working on my own; but Athlon's app isn't completely useless. You can bulk export shot sessions into Excel / Google Sheets / Calc for processing if that's your thing.
But, for a chrono at the range, it's dead simple, and works very well, even in extremely cold weather.