DigitelD,
I have taught in a Cisco Network Academy for about 8 years and the 4 courses/content from Cisco for the CCNA are FANTASTIC!!
It should get you about 85-95% ready for the CCNA depending on how well your instructor takes advantage of all that Cisco has available for these classes and how well they know what they are teaching!
If the instructors know their stuff and they teach the course the way Cisco wants and they have the Cisco hardware and they have you do the hands-on labs and YOU do all that you are asked - it will be a GREAT learning experience!
I still would get the Sybex CCNA Study Guide and read that for another view on things - as with Cisco Press books - the Academy Program tends to go into MUCH greater detail to make you well rounded Cisco network admins and not just enough to pass the exam - which of course is a good thing
The Sybex book will help you when you go to study for the exam and want to study just what will be on the exam.
Like I said, it gives you a different view on things and tends to make complex topics much easier to understand - between the Academy Program and Sybex - you should have no trouble with the CCNA!
This is a great program when it is done how CISCO wants it to be done - I have seen instructors and schools that want to do their own thing or think they know better then Cisco and things are not as great :-(
Hope this helps!
E.A. Broda
CCNA, CCDA, CCAI, Network +