The only tradeoff is that you will have to be satisfied with Amazon’s ecosystem as you wont have access to the content on the Google Play Store or the Google apps.
If you are not into the Kindle Fire HD 8.9 you can consider spending the extra for the latest iPad or the Google Nexus 10, but if you are an Amazon Prime user the Kindle Fire HD may be the right tablet for you.
Watch the following video review and see if this device has what it takes win you over.
You can read a detailed review of the Amazon Kindle Fire HD 8.9 over at PhoneArena