I have programmed the 650 and while it is easy to set-up with many flexible options, the Sync is a tad difficult. I found that unless the 650 is plugged into the USB port on start-up, the driver would not be reliably loaded resulting in no sync capability. Moreover, the help has acc. Logitech be disabled, why this is not a default is odd.
Having said that, it is now in operation and has made the 8 remote nightmare a memory of the past. So overall, just love it...
5Pcs 90 Degree Angled USB 3.0 19/20Pin PC Motherboard Internal Header Connector
29 Nov, 2018
USB3.0 angled motherboard connector to allow fitting in tight spaces
The very low profile enabled connection to the motherboard of a USB3 cable when the height was restricted from a 5.25" bay Front Panel with 2x USB3 connectors.