I just purchased and downloaded ACDSee Pro 6 and I think I like it. Years ago I've had version 2.5 I think but I stopped using it because it was sluggish and crashed all the time, but that was on a 32bit windows.
Now, the program flies easily, lots of good organizing features, seems clear and straightforward, many adjustment options, batch processing, etc. It seems to have a lot more things that I remembered from the old one, so it will take some time to learn it (again), but my first impressions are good and very promising. Hope it will not disappoint (like so many others, such as Corel PaintShop Pro X14 for e.g. which is a total disaster). We will see... :-)