I made the mistake of choosing Paychex for a self-directed 401K plan as a small business owner. The sales person sold me the wrong type of plan, and the customer service has been horrible for over three years. They lost documents consistently, were unresponsive to requests, and their fees were too high for the service rendered. There are other options for owners who want a self-employed 401K plan with other vendors that do not charge such high fees, including $1,500 to transfer the plan assets.