Gymtime, are you referring to COG? With a towel...yeah, probably not an issue. With the pads though, they can roll easy, so if you set it where you'd normally set the bar, you may find that the bar wants to roll down your back at heavy weights....and nobody likes to have their arms torn off at the shoulder (Merely a flesh wound!). Because of this, people will tend to lean forward more or carry the bar too high (or both) to work around this obstacle. That can be a problem.