Mount a samba share on the fly without having it mounted statically at boot via the /etc/fstab file can bring you the advantage of an unpainful boot in case of unavailability of the samba server like in the following common scenarios:
- laptop: you mount your pc share at home, but when you move it becomes unavailable
- workstation: you mount the share of your workmate – but when he/she goes on holiday his/her workstation stays off