In terms of F5 Advanced WAF's most valuable features, I would definitely say its stability. F5 is one the most stable products. Either as the load balancer or the web application firewall, it is very stable.
F5 Advanced WAF delivers superior security through AI, with features like DDoS and antivirus protection, advanced load balancing, and compliance tools. It allows extensive customization via iRules. However, deployment complexity, additional module requirements, and pricing inflexibility pose challenges. Scalability and logging issues remain, while threat intelligence needs enhancement. Despite these drawbacks, its technical support and policy flexibility outshine competitors, but significant expertise is needed for effective use.