T-Moble's Personal CellSpot Available Today for $25
If you have a router you already have this.
Benefits of Wireless AC over Wireless G or even Wireless N include faster speeds (1 Gbps+), less crowded wireless bands, much wider range, and better wall penetration.
If you already have a $200+ router, then yes you can already do everything this one does. But, if you're 90% of the wifi-connected population, then no you don't already have this.
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