It seemed like a decade in the making but has the IPv6 transit between Cogent and Google (via that showed up last fall remained stable?  I’d ruled them out on a number of projects for this reason but may reconsider if it has been reliable.  Appears HE (ASN6939) is still unreachable though…  I feel like less entities are single homed to HE, but it would still be a calculated risk.

Thanks,

David