nChronos, a product of Colasoft, is one of the cutting edge packet/network analysers that the market has to offer today. What we have been promised by Colosoft through their creation is an end to end, round the clock packet analysis, coupled with historical network analysis. nChronos provides an enterprise network management platform which enables users to troubleshoot, diagnose and address network security and performance issues.
As an independent troubleshooter, I am always interested in tools that are portable and provide instant information. Many times when I am looking at a customer's problem, I cannot assume that they will graciously give me their SNMP strings or access to their network management system. That being the case, RMON and any other flavor of Flow would also be out of the question as well. Honestly, I hope a customer wouldn't willingly give out that kind of information or access to anyone.