The Xtreme case is very versatile by design. The case itself is a double layer construction comprised of a silicone as the first line of defense and a hard duro vest protector as they call it which is a polycarbonate hard shell that installs on top of the silicone. This duro vest protector has a built in kickstand on the back which doesn't add bulk and is nicely built in. In addition to all of this, Qmadix even includes a holster which also doubles as a kickstand with the high quality belt clip.
As far as access to the ports and controls while the case is installed, the top has an oversized cutout for the headphone jack and secondary mic while the on/off switch is covered by the soft silicone. The bottom of the case has a nice oversized cutout for the 30 pin dock connector port and 2 more separate cutouts for the speaker and microphone. The left hand side has an oversized cutout for the silent/vibrate switch so that it is compatible with all versions of the iPhone 4 - in addition to this, the volume buttons are both covered with soft silicone just like the on/off switch.
This case certainly should stand up to quite a bit of abuse with its rugged design. Qmadix nailed it again with another great design and great product. This gem of a case sells for $34.99 and is highly recommended!