Packet over SONet/SDH (POS) experience?

There has been a recent bit of scare mongering from Lucent about PPP over SONet/SDH over on the IETF-PPP list. Has anyone (that has deployed) been having incident reports? For anyone seriously interested in the deep technical issues, you might send "subscribe pppsdh" to pppsdh-request@greendragon.com. I hope to cover operational issues in the next revision of RFC-1619, so I'd really welcome folks already deploying this on the Cisco or Ascend. WSimpson@UMich.edu Key fingerprint = 17 40 5E 67 15 6F 31 26 DD 0D B9 9B 6A 15 2C 32