I recently switched from MALA to AttractMode, and absolutely love it! I didn't attempt to automatically port my layouts or game lists, so I can't speak to how well that works; I just recreated them from scratch (except with the same art I had used before) while I learned the Squirrel scripting. It is quite powerful, and extremely customizable, especially if you're willing to delve into the scripting. As for running on XP, it is running smooth as butter for me on old, crappy hardware, and far more responsively than MALA ever did!