They only announce a /64 prefix via RA (with no DHCPv6 or DHCPv6-PD), so address assignments are via SLAAC. For that ISP (Wave G), I use NDP proxying to allow the LAN side to utilize those addresses as well.
The big advantage to Wave G is that they have symmetrical gigabit download/upload rates. Comcast, on the other hand, provides gigabit download rates but ~30-40Mbit upload rates.