I am commenting rather than rating since this program is applicable to both professional and amatuer users

As others state the program is fast and user friendly, many of the features are obviously pointed at the professional user who can afford the steep price

For the casual user Picture Arena is much less expensive, equally fast and provides most of the same features, Picture Arena also has a separate dedicated iPhoto browser which can be usefull for the amateur.although picture Arena has a somewhat un-Mac like UI and a bunch of not very usefull editing tools

If you have the bucks Photo Mecanic can not be beat

If you