Despite some hiccups getting started (per this msg thread just concluded), i can now say with some confidence: come on in, the water’s fine!
Guess i should qualify that statement by saying: i’m on iOS, can’t verify that both the Field Kit mobile app and PWA version are working perfectly on Android (though a colleague of mine did a quick test of FieldKit on 'droid, and it appeared to launch and sync w/o trouble), our instance is hosted at Farmier (farmos.net), and it’s very early days for us, so i can’t say my testing has been comprehensive as of yet.
Still: if like me, you are motivated to have mobile access to farmOS (for me, it’s a mandatory requirement), then i hope you will join us in testing, so together we can ensure this thing is bulletproof in all our various use-cases.