What does the software or service do well? It is priced well compared to the competition. However, considering that they screw up everything and you get stuck with penalties, it is completely not worth it.
What does the software or service not do well? Absolutely awful. Make a lot of mistakes, do not file payroll reports timely or accurately. Worst of all, no response from the customer service. If you care about your time and clients, stay away.
What do you wish you had known about the software or service before using? The level of customer support is zero.