Amazon Kindle Fire owners get more digital content, but aren't as happy as their iPad-using counterparts, ChangeWave found Thursday. About 29 percent said they would spend more in the next 90 days, a 10-point lead over those who didn't have the Android tablet. Even so, only 54 percent said they were "very satisfied" with the device, or well under the 74 percent of iPad owners who were similarly happy.
