I'm using one with my A1200. It works pretty good, except that it doesn't handle interlacing too well; in fact it doesn't de-interlace at all. There's also some picture instability (checkerboarded areas have a sort of "shimmering" effect) in 640-pixel-wide modes, but almost all of that can be cleared up by playing with the settings.
I need to figure out how to build a sort of bypass switch so I can use Productivity-type modes, because it will not pass through VGA over the RGB port. Set the screen to anything other than 15 KHZ and it'll go blank.
As far as I can tell, both PAL and NTSC work perfectly on the XRGB-2+.
