Yep, exactly the reason I went to Be. My SNR was up to 12dB with no sign of reducing - and my Netgear doesn't support DMT - and ... well I'm sure you can guess the rest.
After > 6 months of constant 8128kbps sync, it got to the stage that depending on time of day, I would sync at either > 7Mb or 4Mb - although it does look like my fluctuating SNR problem has gone away, coincidentally with the neighbours downstairs moving out??
The lower profile thing makes sense - too bad if you're on the borderline though. These IP profiles are one of the most stupid things I've ever encountered to be honest - why can't they just dynamically set an IP profile that is say 10% less than your connection speed at sync time, and have done with it.. I'm sure it would take much less processing power than all this complicated DLM stuff that doesn't work properly!
Btw, any questions about Be, ask away... although I shouldn't think there's that much to ask .. plug n go!
About the only thing I can think of is if you've opted for static IP? In which case if you don't receive your letter before you get switched over you'll have to phone the support desk to find what details you have to put into the router. It's not the same as BT - it's essentially a routed ethernet over ATM connection, no PPP involved. So you have to manually specify static IP, DNS servers etc in the router setup. But the support desk will give you the info straight away, or at least they did with me