I've used this to put my Commodore 128 80 Column output on VGA screens.
It functions, but IS limited to 8 CGA colors since it doesn't support the intensity output from the C=128's RGBI.
If you get one of the C128 RGBI to RGBA adapters available, this should replace the Gonbes style devices.
It's almost brand new. I've only used it for about 2 hours total.
It also works with my Amiga 500.
Not shown but included is a brand new VGA Cable.