The features I found most valuable are the ease of deployment, it's easy to upgrade, easy to configure and easy to administer. There is no need for vendor professional services which saves project cost. The usage of WebUI for all primary features like hostname, IP address, SNMP traps, zone sets, addition and deletion of zone members or zone sets, backup of switch DB is very simple. 

The CLI mode is also very easy to use for deployment, management and administration. The commands are easy to remember and is also user-friendly to do all management and administration tasks. It helps to meet network security requirements of role-based access based on AAA. It's easy to integrate with LDAP, Active Directory. It supports FTP, SFTP, SSHv2, SNMPv3 and also supports AES and many more features.

MDS's reliability is at a high level. The issues with these switches are extremely rare, and the whole product line is very predictable and stable. 

The most valuable features of this solution are the devices, databases, and zoning.