The Zowie EC1-A was the large-hand counterpart to the iconic EC2-A, featuring the PMW3310 sensor at 97 grams wired. During the golden age of CS:GO, players with larger hands who couldn't comfortably use the EC2-A turned to the EC1-A as their primary choice. Professional players like f0rest and rain famously used EC1 variants during their competitive peaks, demonstrating that the larger shape could compete at the highest level. The EC1-A's PMW3310 sensor shared the same occasional spin-out limitation as the EC2-A, but players accepted this tradeoff for the unmatched shape comfort. It was the definitive large ergonomic mouse of the mid-2010s esports era.