Very good100/100
The Godox V100 is probably one of the best clip-on flashes currently available. We liked it well when we tested it and couldn't identify any relevant weak points. A cheaper alternative, which is also available for all common systems, could be the Rollei HS Freeze Is, which is available for around 230 euros.
This test report belongs to a different type: Speedlite V100 OM System / Panasonic (Plug-on flash, Olympus, Panasonic)