I have a Combro which certainly didn't like FAC velocities but its accurate enough with sub-12 and it can be connected to a lap-top albeit with £20 worth of cables.
I also have a Caldwell, a bargain picked up second hand. Its battery hungry, its very fussy indoors without the light kit and even cloudy days throw up constant error codes.
Its supposed to connect to a mobile via 4 pole jack but wouldn't connect to i-phone or android for me. I loaded an android emulator to to my laptop and again wouldn't connect via the headphone jack or USB adapter.
Could be why it was cheap but it seems they did have connection software issues to start with.
I 've clipped it 3 times now almost PBR at 40ft lbs, lazy pointing in the shed. Big bang and a ricochet but it didn't disintergrate or stop working, fairly sure it wouldn't take one square in the display though.
I'm still tempted by one of the R2s.