Just had mine stolen yesterday. Find my iPad is not what you think. I had it on mine. Unless they connectmy WiFi only model so unless the device connects to wifi, it sthe service is useless.
Also, if you decide to not have a passcode lock in order to try to track down the iPad, you are leaving it open for the thief to get any personal data. Sending a remote lock or setting a passcode does secure your data, but at the same time makes it less likely you will find it. For me, I have opted for the erase mode. As soon as it is turned back in andor ever hits wifiWiFfi before it gets erased, all existing data will then be erased.