We just completed the process of switching over from Paychex to ZenPayroll. It's now clear to me why companies like Paychex should be very worried. ZenPayroll's online dashboard is orders of magnitude simpler and more intuitive than Paychex'. By automating most of the process (in lieu of a payroll specialist calling you every 2 weeks), their cost structure will enable them to always beat Paychex on price.