Anyone Own The Original Whizzinator?

[bibobi]

Ive been wanting to get this product but I cant find any videos or anything online only pictures but im wondering since theres a little clip and the makers of the whizzinator say to try and disguise the sound of the clip when you open it by clearing your throat then how loud is the sound of the clip being opened , I mean it seems like these guys made a good product here but the clip making sounds when opened seems sketchy to me.
Does anyone actually own one of these and if so how loud would you say the noise from the clip is when opened? loud enough to get you caught if not careful? or is it something that should be of any concern?