The best thing about this product so far has been its customer support team who are very responsive to our queries even when we were paying them through different billing solutions like Xero or Sage Payroll etc! I would say that there's nothing much special as well apart than being able solve my problem of creating invoices which was not working at times due to some technical error / bug within Invoice creation process - it used be stuck sometimes before giving me option whether invoice should create successfully/failurefully after inputting correct information into required fields (which includes date of order).