If you perform compilations and/or reviews (and no audits), you most likely need an Engagement Review every three years to satisfy state and/or AICPA licensing requirements. A peer review is an economical way to obtain an objective review of the quality of work you perform, with the goal of providing recommendations for improvement. The valuable result to your firm is risk reduction and peace of mind.
An Off-Site Peer Review can be much less expensive than the traditional On-Site review. If your firm qualifies, the Off-Site review makes good business sense.