I use it on public transport where the smaller size and lighter weght are significant.
It also makes a very nice GPS unit in the car running CoPilot or Route 66. The iPad is definitely to big for that. Also the WiFi only has GPS whuch is not the case with the iPad.
Battery life is about the same as the iPad. It's a 32 GB WiFi only with 32 GB micro SD card. I tether it to my mobile for 3G.
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