No static IP on fiber connections (like they promised initially), no native IPv6 (although maybe there is on the DSL products), outbound SMTP blocked. For a while there was a tool you could use to adjust your DSL profile to skew it towards upstream bandwidth, but that's since been dropped. No more m-bone access. Stuff like that.

Sonic's shifted from offering a full featured internet connection to a slightly neutered dumb web browsing pipe.