4 year old loves it!
My four YO grandson tried this out for the first time last night. His words "I LOVE my new game!" I was impressed with how easy he was pulled into the activities and the sense of acomplishment he had when matching sounds to letters and listening to the sounds and matching to words. The L sound is weird though. Doesnt sound right but for everything else it is great.

Not supported on Mac OS X
This product is not supported on Mac OS X as indicated in the product description. The product says it works with Mac OS 7.5 or greater. To me, 10 is greater then 7.5 so I assumed it worked. It didn't and when I contacted the company (I purchased it from EducationMax) they told me that my Operating System was to new. I've had the same Mac for 10 years and my Operating System is at least 2-3 years old. I'm in the process of returning the product. I'm rating EducationMax 1 Star, not Reader Rabbit.

Avoid - Bug in CD teaches kids how to spell incorrectly
The Piano portion of this game has a bug that teaches you how to spell incorrectly. There are no updates to fix this problem, and the manufacturer no longer supports the game.

Very Loud
My 5 year old loves this, however I find it loud and a bit to "young" for her. It does not offer anything for her to learn. It just goes over what she knows.

Buggy Software!
Excellent game, but I've got v1.3 (under XP, and tried on two PCs) and it has a bad software bug with the piano game, as other reviewers have stated. Otherwise I'd give it 5 stars.

This is what I got back from customer support regarding the bug:

"Thank you for your inquiry and for choosing Riverdeep, Broderbund, The
Learning Company, and Edmark for your software needs.

Unfortunately, this issue does not have a resolution. I want to apologize
for this inconvenience."

It's still well worth the purchase if you're willing to sit with your child during the piano game to try to prevent any confusion and frustration.