It's a powerful piece of software, true, but I don't think it is that complex - 95% of the time I just use it to tell iPhoto which of my 5 photo libraries I want to open.
The other 5% of the time was just after I got the program - and that was to rebuild the library and then move events out of it into several new libraries for easier backup.
To do all that without having to take the Mac over to an Apple store I thought was worth the $20.
It DOES come as a free trial to let you get a feel for how it works (some of the features are limited before you pay, however).
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