I'm somewhat of a newbie here, but have been on AGO for a long time, following Mike P. when he moved from Meguiar's. The atmosphere here is more casual and friendly, but AGO is more informative, so I visit both regularly. Haven't placed an order recently, 'cause I'm pretty well stocked up. AG has BOGOs that I often take advantage of, but ACC has far more giveaway opportunities. Win or lose, the anticipation alone adds a bit of excitement to an otherwise boring day, so I'm gonna have to move some of my purchases in the ACC direction.
Bill