I migrated to "Be 16" early this morning and so far so good.
I was using a Netgear DG834 and that had synced at 12Mbps following the change over (with a tweaked SNR). I've since moved back to my Cisco 877W (with the latest ADSL patch) and things are looking stable. Maybe try dropping the SNR a bit.
Current ISP: Xilo LLU (via Cable & Wireless)
Previous ISP: Zen (for 9 years).