To be honest, my DSL with XNet has been pretty good lately, because the drops where I end up getting a different v4 address which is a bit annoying.
(But still static v6, woo)
I wouldn't mind a static v4 address, since i'm always online anyway :| But apart from SNAP (Who still do dynamic v6 prefixes) no other ISP does v6 over DSL. (That I know of)
Speed hasn't been a problem either, even during peak.