At KTT 3.0, Becca Lamon and myself held separate sessions on the subject. I spend a lot of time discussing how it can transform your classroom and how the students perceive the device when the tasks that are being accomplished are beyond what they could possibly do without that piece of technology.
Matt Miller posted about his experience in Becca Lamon's session. He gave the SAMR model (a method of measuring a digital tool's usefulness) a great explanation. I invite you to read his post on it by clicking on the image below.