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Thanks all for being gentle in your responses  :-)  Some very valid reasons given that I've been able to avoid (so far) but I do understand how it is necessary at times.

About 7 years ago security came to me to do some url rewriting for a security hole and I told them the Load Balancer we were using could not do that.
I guess they still remember that day and haven’t came back since.  The Load Balancer I have today (Netscalers) are now more than capable of doing it and I haven't volunteered it as a solution.  I'll see how long I can keep it to myself!

I'm going to play with the RESET option and see how the app community likes that one.

Say I have some Load Balancers (10k's) that are running rather mildly with 4,000+ http requests /sec at about 40% mem and 40% CPU.  What should I expect to see with a Global rewrite policy if I have to make all of the 4xx and 5xx responses to the outside world 200's with some specific text?

I'd just hate to put it in and see the boxes tank when the real world hits them.  I'm still rather timid because of past tragedies with other vendors products.