Taking a quick look over the exterior of the One, it is found to have a high quality finish. The back side is slightly flared out to provide some additional room for cable management behind the motherboard tray. While the majority of the case is made out of steel, the front bezel is a mix of plastic and metal mesh for the drive bay covers.
At the very top of the front bezel is the standard I/O panel, which includes a reset button, two USB 3.0 ports, headphone/microphone jacks and a power switch. While the USB ports are designed for USB 3.0, keep in mind that Antec includes a USB 3.0 to USB 2.0 adapter for those that are not ready to implement USB 3.0 with an internal header connection. Directly below the I/O panel are the 5.25" drive bays. The bottom section of the front bezel includes additional mesh covered bays to provide some airflow and we also find the Antec logo at the very bottom of the case.
The side panel is pretty plain, once again it is slightly flared out, however this time it doesn't need to be for cable management; it is purely for looks. There is a single mount on the side panel for an optional 120mm case fan. There is no window pre-installed on this case, however somebody that likes to mod could easily put a window on this blank slate of a side panel.
The below left picture takes a look at the rear of the case, showing off the bottom mounted power supply, two rubber grommeted holes for water cooling tubes, the standard expansion ports, motherboard I/O port, and the pre-installed 120mm exhaust fan. The below right picture shows the top of the case which is plain, except for the 120mm top exhaust fan.
The bottom of the case looks like what you would expect. There are four feet to keep the case off the ground so the power supply can draw in cool air. Antec has included a power supply fan filter on the One, which can be easily removed for cleaning. Of note is that there is a mount for an optional 120mm or 140mm bottom intake fan, but the filter does not extend to cover this area.