[Kushan]

Yes Osem, if you don't have wireless-n, then wirelessly you won't see much benefit if you use your netgear router. However, wired you definitely will see a benefit.

For all intents and purposes, the Superhub in Modem mode and what you have now are largely identical as far as you'll see - just the speed will be faster.

Finally, even if your netgear is only wireless-g, I would still consider using it above the Superhub's awful wireless and router mode. It's really that bad.