Two surprises in the performance results of the group were the KA-9226ACU and the KA-9228. While the 9226ACU was the best performing of the Kingwin Coolers I have to say I was expecting a bit more out of the all copper unit and sandwiched fan. On the flip side, I was completely shocked by how well the KA-9228 performed. Very good performance at exactly half the price of the competition.