It's pretty easy to tell if you'll need a new Modem or not.
The ONLY modems capable of 30Mbit and higher are the Superhub and the Ambit 300 (This one:
http://www.techfresh.net/wp-content/...rgin-modem.jpg). That's it.
Any other modems can only do up to 20 at best. Some REALLY old modems can't even do that, but it's very unlikely you'll even have any of those (You're talking NTL 120's and the like).
SO as a rule of thumb:
10Meg users won't need a new modem
20Meg users that don't have a Superhub WILL need a new Modem
30Meg and higher users won't need a new modem (It's impossible to be on 30meg and on an old modem - believe me, I've seen Engineers try it!).
The jury's still out on what happens with the Ambit 300 users on 50meg, but don't be surprised if they need a superhub as well.
IMPORTANT THING TO REMEMBER: MOST of the issues with the superhub are regarding its capabilities as a router. As a modem, it's absolutely fine - and if you have a standalone router (Such as a netgear or a D-link) you OWN it and can continue to use it with a Superhub, just remember that unless it's wireless-N, you won't get much benefit out of your new speeds.
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