Have an indi ECS and the AGA Mk2. Love both. The ECS version was from the latest batch and needed a couple of fixes for it to work but now it's very crisp/clear.
The AGA 2 has a great picture almost like an RTG card display. All the resolutions I've thrown at it has worked. You can control the output fine under workbench but when playing games it moves the picture to the right so games are not in the center. No big deal still see the entire game on screen and I can change it with my monitor :-)
But the picture is amazing, couldn't live without it TBH.