The feature is nice, but who would like to have a hard drive installed like that for a longer period? There's no shock/noise absorbing around the drive, making it likely that older hard drives might be a bit noisy.
Removing the front takes about 5 seconds, making it easier for the user to install 5.25" drives as well as cleaning the front fan and dust filters.
The dust filters is placed on the inside of the fan grill. You could call these filters removable, as the entire front is easy remove and clean.
At the bottom, Cooler Master has equipped the CM 690 II Advanced case with a static dust filter. The dust filters blocks the incoming dust.