the superhub is a complete pile of pants...
as explained by the few 'technicians' i've had out to me in the past, the reason VM customers are stuck with their modems is due partly to the DOCSIS 3.0 decoding and the fact that the cable is designed to give a DNS to only your MAC addressed modem - granted you could probably get a device to spoof this MAC address but gets all complicated...
it WILL take a few minutes, nowhere near 5, closer to 1-2 at longest to establish a connection.
i personally only use the superhub in 'modem only' mode and have it connected up to my asus RT-N66U modem giving me some pretty decent range on a dual band network through my home... this is an option too if you want to share USB devices, use a DNS routing service like openDNS/DynDNS for web filtering (think parental control at a router level here) and loads of other cool features like downloading using the router!