Interlaced seems fine and rock solid as another user had posted.
I experienced problems with long term use BEFORE I installed a tiny fan on top of the case. A 12v fan with rubber bumpers is all I am using - that sucks the air from, through and out of, the A1200's case (sitting on top of the vents, above where the AGA card resides). Not sure if the Indivision product (like most electronics) require a "break-in" time, but all seems good now. Am going to continue using the fan as I'd like to avoid an overheating scenario if I can help it.
It does seem that users of HP Lisa's are having, or have had, problems with seating the Indivision board *AND* potential other software incompatibilities.
All seems fine now and am enjoying my Miggy as I haven't in years.
Utilising Hi-Res Workbench screens for the 1st time outside of an Amiga with a 1084 (ie: aWeb, iBrowse, NewsRog) has me wanting a real video accelerator however :-) Same goes with the prospect of upgrading from the current processor I have (an 030).
All in all, breathing new life into an A1200 outfitted with the Indivision AGA card... would LOVE to expand it even further to be a more formidable machine.
Guess I'd like to explore this SAM/4.1 option I keep hearing about :-)
Bottom line Re: Indivision AGA - you cannot go wrong. Especially for games. This is a top notch, Class A, well thought out product that is worth every penny of its asking price.