I am currently an ADP customer. I am not always happy with them but for the most part they do a good job.
I had Paycom call on me during a time of tremendous transition. I told the sales person that I was not interested at the moment so she circumvented me and went to the CFO of the company which I find to be very distasteful. I hate underhanded sales people and Paycom seems to be ripe with them.
They come in and badmouth other payroll companies too which I think is totally unprofessional. Not a fan at all.
Reason of review: Poor customer service.