With comparable performance as the Startech device, the pass through Silverstone EC03 certainly seems like a worthy purchase, especially considering the front panel connectivity options. Also, this is the only PCIe USB 3.0 card available at the moment that supports an internal header allowing for front panel connection.
The only downside of note is that it doesn’t have any rear connectors of its own so we wern’t able to find out if the cabling causes any drop in performance.
Front panel connectors
No rear panel connector options