Indivision AGA is a bit hard to configure, but can produce excellent results. I run my Workbench in 1280 x 1024 mode, which on my 17" LCD panel looks perfectly.
For games and apps running in PAL I have created new VGA mode: 640 x 512 and set Indivision to double both horizontally and vertically. The mode is upscaled by monitor adding some blur, which is good thing for such low resolution as PAL. I've also turned on scanline simulation with 25% depth. Then games/demos look almost like on CRT, but with perfect geometry and full screen.
The only disadvantage for games and demos is that Indivision frame cannot be synchronized with Amiga vertical blanking. There is a gadget for this in the settings program, but it is not (yet?) functonal. Then, even if the output mode is @ 50 Hz, scrolling is not perfectly smooth because of lack of sync.