Think about it
$7 a month modem rental fee, Even more if you opt for there [censored] WiFi router. Over the term of the contract, That'll cost you $168 at the least.
For that, You can get a Motorola SB6141 and a superb Asus dual band
WiFi router, all for less then $160
Dump there outdated, poor quality hardware, And check all your Coax.
Save yourself some $$$, And have only the NSA to worry about