crashz, I concur with what you said, but have been so surprised by the marked difference the H2O injection makes. When the indicator light comes on the power is quite noticeable.
I know that cylinder pressures have to be increased but is the steam effect severe enough to cause problems??

My main reason to add was to cool intake charge on hard pulls @ over 20000#gvw. I do not know the outcome of this benefit as of now.