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My misses used to use one when working away. As long as the cellular signal is good then shouldn't be too many issues. From the ones I've seen, the wireless signal from them isn't that great though, I'd only use if relatively close to the device.
I've used one until recently and it was perfectly fine. It had a nice feature of allowing free data access in a host of countries around the world (rather than me getting ripped off when connecting while abroad).
If you know where you're likely to be when using it there are websites where you can check the coverage.