The 303 is available in a black or white color scheme, take note for the white version that just the front bezel, one of the side panel and the rest of the exterior panels are painted in white. The innards remain black to accentuate that professional accent.

The standard 3mm tinted tempered glass side panel is easily removable via the top handle; no more need for any tool to remove 4 screws to gain access to the internal components. Optional a solid closed side panel with affixed thumbscrews is available, though I hardly see anyone going for this option. The tempered glass wow factor is what these In Win cases are all about.

Once the tempered glass side panel is removed, we spot the atypical interior with a separate top chamber for the upright installation of the power supply. A pretty unusual case layout as in most modern cases the power supply is located in the bottom. That same chamber is also used as support for up to a 360mm radiator (supporting maximum 70mm in height) if one opts to use a 360 radiator it means the power supply would be positioned directly behind a part of the radiator, thus receiving warm air from the radiator. Maybe better to just opt for a 240mm radiator, this if one goes for a top installation of your favorite AIO or water cooling device. The In Win is an ATX compatible mid-tower case and has a volume of nearly 52 liters; it is similar to other cases in its price range, though most of these have optical drive support, a feature neglected by the In Win engineers.

One can spot the numerous cutouts to facilitate the cable management and processor cooling installation, no rubber grommets to be found. Only one 120mm silent rear fan is included, the ambient air needs to come in via the bottom part. Up to 3 x 120 mm fans can be installed to create that extra air flow.  A big dust filter takes care of any unwanted particles trying to reach to your hardware components.

The bottom dust filter is easily removable  by sliding and a big improvement versus the magnetic ones from the 805. This method of fixation is way more solid and cheaper. The case itself rests on two oversized plastic feet, each equipped with two rubber pads to avoid any sliding.