Has anyone used these?

Is it safe to solder on wires and connect sensors or were they for test points during manufacture?
The lastest software version (4) has a great QR add-on - easy to use, useful and well worth updating for.
Yep, they’re intended to be used :)
The top five are our standard I2C Breakout Garden pinout so can be used for connections to breakouts/sensors that don’t have a Qw/ST connector (or for soldering on a Breakout Garden slot) and then at the bottom you’ve got broken out UART and SWD pins for debug programming.