It all depends on the software you're trying to promote. If it uses system calls and all system-legal accesses, chances are it will work fine (I've used it for years without problem). You'll only have trouble when programs access the chipset directly. Which, unfortunately is the majority of games.
If you have a TV card, there are ways of getting it to run the game through this if the game is startable from Workbench, also used this method for some things, but in the end a scandoubler is probably your best bet...
