Network filtering through firewalls, ACLs and other security mechanisms such as IDS/IPS make troubleshooting a more difficult task with the "typical" tool sets. Traceroute and ping are a thing of the past as far as their usefulness. Tools today must mimick the actual service traffic they are attempting to identify and/or troubleshoot. PA Pro is great at this! An easy to use GUI allows even the novice to use and understand (with features like synopsis and chart graphs) but more importantly PA Pro has the featureset and flexibility to be an excellent tool for even the most advanced security engineer. I don't believe any tool should be considered "all-in-one" but PA Pro does a great job of eliminating many tools from the network/security admins tool kit. I have used it on Mac and Windows (through Parallels on MacBook Pro) and had no issues with installations or use. Its a bummer about TCP in Windows but maybe Microsoft will hear enough complaints over their XP SP2 doings and fix this in Vista. ;-)

I would recommend this tool to anyone in the sysadmin, network admin or security arena! Its functionality and ease of use cannot be found for this price in many (if any) other products.