From standard 10-inch slates to smaller 7-inch tablets and giant 12-inchers like the Samsung Galaxy Note Pro, todays tablets come in all forms and sizes. Tablet shoppers in the U.S. have more options today than ever before, but according to the IDC this could mean there are some serious industry challenges moving forward. Its becoming increasingly clear that markets such as the U.S. are reaching high levels of consumer saturation, the IDCs Tom Mainelli said in a recent report.