NX-OS as LSR router

Dear Nanog'er, Anybody using NX-OS on MPLS LSR and/or Edge-LSR ? We are evaluating the replacement of 7600 LSR routers. Our natural carrier/ISP choice would go for XR everywhere, but we are also curious about NX-OS on the core. Why not NX-OS for LSR and XR for Edge-LSR ? Thank, -Marcel