Samba Success in the Enterprise?

gunnk writes: "We've deployed a Samba server here to replace some aging Novell Netware boxes. It works great: fast, secure, stable. However, we have one VIP that feels that Samba is "amateur" software and that we should be buying Windows servers. I've been searching with little success for large Samba deployments in enterprise environments. Anyone out there care to share stories of places that are happily running large Samba installations for their file servers? Or not so happy, for that matter — better to be informed!"