(Full disclosure - this is a competitor product for me)
I did a full deep tech review on a very similar (looks identical - but different brand off Ali) muzzle mounted Chrony - 40min video if you cant sleep.
Overall it wasnt too bad - great fit & finish, if it works - then it'll be ok
Issues - internals & longevity i have some big concerns over, installing the app was turning off my phones security & downloading a file from a Chinese server, no ability for large calibers or over moderators - anything other than 1/2 UNF, didnt check the accuracy against my certified chronys - from memory it couldnt tell the difference between 1,000 & 1,005 fps - which isnt too bad, usual fiddly buttons & painful programming sequences to deal with - set modes, change pellets etc
Have a look on the AGF UK forum, a lot of them have been purchased - under a different name "Air Force one"