EXPERT RESPONSE
In general (for all technology needs, not specifically Application Delivery Networking), I don't draw much of a line between open source and commercial offerings, I try to look at it more generally to try and find the "right tool for the job", and the total cost to the business of any given solution (including one-time and on-going man hours that may be required with either solution, but more-so open source).
In the case of Application Delivery Networking in particular, I would say the open source community doesn't have a solution yet. There are some isolated projects that each offer a tiny fraction of the needed functionality, but even adding them all together we're still 99 yards shy of the finish line -- open source honestly doesn't have a solution yet: this is an area where open source offerings are still in their very early stages.
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