what he said. One of the common problems that will cause complaints is when people place the tank too low on the rig. They are used to the very low tank height encountered with normal jacket bc's, and don't move it high enough. Another problem is if you are using long turret first stages like the MK25 from Scubapro, or the Atomics, and the swivel turret is straight down. That can be a legitimate problem, however it is not the ideal position for those regulators to be in. Central inflator hose position is preferable for many reasons, though I don't have mine coming straight up and out, it is angled to head towards the shoulder strap