I did a short side by side comparison of ACDSee and Photo Mechanic and they both have some strengths. This wasn't an exhaustive test and I'm going to continue to use them both and I'll let you know where I end up.
Photo Mechanic VS.
ACDSee- Strengths of PM-
1. I love the simplicity of PM! but you miss out on some options that ACDSee has
2. PM is BLAZING FAST
3. Great option for larger thumbnails in PM - ACDsee is easier to switch back and forth from thumbnail to large view
4. Ability to view Mark II raw files in PM is nice but not really necessary b/c you can't edit them there anyway so you might as well just bring in the edited JPG's
- Weaknesses of PM-
1. Difficult to delete files in both thumbnail and large view (this may be a user issue) :-) but I wasn't able to remove the "Are you sure you want to delete" screen from either my mac or windows machine and ACDSee provides that option in their Preferences screen. With a mac in thumbnail view you have to "Command - Delete" and then verify which is too many steps to go through with 1000 photos.
2. Switching from thumbnail view to large view is also not quick enough. With ACDSee you can simply double click on the large view screen and it'll take you back to the thumbnail screen. With PM you have to actually close the box via Command W or by moving your mouse all the way across the screen - too much work! I found the best way to work is to stay in the large view with the smaller thumbnails.
3 Limited options all around but this software seems kinda new so I'm sure they're working to make it better.
...If I can figure out a way around the delete problem I'll probably switch over b/c the bigger thumbs are nice and I love the simplicity and quickness.
Ciao Ciao!
DJ