I tested the performance of Tunnelblick personally using Wireshark and made sure that it’s completely safe. It protects the IP address, traffic, and addresses of the websites you visit. But you should remember that it doesn’t have a kill switch. If your connection becomes interrupted, no matter why, the protection is no more. That’s why you’re better off using apps of the VPN services that provide such protection. The first five providers listed in this review work great on Mac. Besides, they offer settings for Tunnelblick.