The features I have found to be most valuable are the levels of encryption I can enact and the compression I can apply to improve throughput.
OpenVPN Access Server offers multi-factor authentication, reliable security, and easy setup. It supports remote access without complex configurations and is open-source, making it free for many users. However, initial setup can be challenging for beginners, and small businesses may find the pricing high. Some configurations may cause performance issues, and customer support is limited in some regions. Additionally, it lacks advanced security features found in competitors.