I was surprised that MacUpdate had updated the product page, because I had not submitted the information about the new version yet. I guess they got it somehow from CNet. I will update the product page.
To answer your question:
The BirthdayScanner X does:
- add up to 3 customized Alarms to the Birthday Event
- also creates iCal Events for other Dates, like Anniversaries
- the resulting Calendar is a normal calendar, not write protected, so you can modify it to your hearts content
- the Events show the Age of the person
- Finally, you can also just export an ICS file, that way you can import your Address Book birthdays into any other calendar apps, even if not on Mac.