Has anyone tried using RB1000 as a LNS with Cisco/Juniper as the LAC?

Using BCP bridging (PPP tunnel bridging) configured on 2 RB1000, I can get PPPoE tunnel working into a L2TP tunnel. The specific question, has anyone got RB1000 LNS based on BCP bridging working working with a Cisco/Juniper LAC.