If the Netcomm is still working it will suit your needs.
Confirming this. We had (as an "experiment"/test-resource) a Launtel 1000/50 service after our FTTP installation. Achieved 926/46 on our NF18ACV through a spider's-web of ethernet cable and switches. Replacing it will barely – if at all – achieve any performance gain.
If it ain't broke ...