BBA has really appreciated the attention to detail and correctness that OAS has put into every task. They maintain this level of quality while working very efficiently. They are extremely responsive, with a high expectation for timeliness for themselves. This is paired with flexibility for the schedules and demands of their busy clients. Their services have made our invoice delivery and monthly book closure a streamlined process, consistently completed earlier than ever before, and kept us on top of the weekly tasks culminating in the month end.