Labatt—
The major advantage a cellular router, like the one you're describing will give you is slightly better reception, because you can often position the router more easily, and the ability to share the cellular data connection with multiple computers.
Danielh's advice about using the encryption and access restriction features, like MAC address denial, is a very good one. Since most cellular connections are fairly low bandwidth and some are per-megabyte, you really do want to restrict access as much as possible.
You can read about the security features and what to use for a typical WiFi setup and why
here. Although I wrote it over two-and-a-half years ago, it still covers much of what is out there today. At the very minimum, you'd want to turn off the SSID broadcast, and enable the WPA-PSK encryption, with a strong pre-shared key. MAC address denial would be a good idea as well, but some would consider it overkill.
From what I understand, the ones that use a PCMCIA-type cellular modem, rather than the USB ones are better, but YMMV.
__________________
Sailingdog
Telstar 28
New England
You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Captain Malcolm Reynolds, Serenity (slightly edited)
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