Does it really have probelms? See:

 

Sprint Community: Tutorial: Set up your Airave Behind your Router

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Airave - The solution to poor wireless service ...‎ - Nov 2, 2012
Airave: When Sprint leaves you with 3 bad ...‎ - Oct 26, 2012
Airave Will Not Work, Possibly Blocked By ...‎ - Nov 14, 2011
Poor call quality on Airave-causes/solutions?‎ - Sep 12, 2009