I haven't seen a lot of post about air shammees in the self serve bays. Do a lot of operaters use them? If so are you happy with the results? Do they get enough use to warrant installing them or do they just take up space most of the time? Thinking of putting them in my 6 bay but before I go to the trouble of installing new switches (all positions are currently used), make new bay door decals, buy and install just wondering about the ROI on them and if they bring enough to justify. Thanks in advance......