aperture 1.1 was updated to 1.5 which was a huge jump for the program, its intergrated with CS2 and other work flows you might have, as for not workign for PC's well thats apple for ya lol , and yea i agree its a bit laggy at times but thats because the program is always updating itself and your files so there is no loss of memory, i persionaly think its amazing and p.s. before you say lightroom is better give aperture a try i persionaly like it more