I don't know of anyone with the new 4.7L that has, but I can say that superchips is honest, I've seen their dynos compared to customers actual dynos on other vehicles and they are about spot on. I plan to dyno mine in about a year or two once I have all the bolt on stuff I want installed. I'm hoping to get as close to 300rwhp as possible, which might be a hair optimistic, but should be close.
If you find one elsewhere, please post it. I'm pretty sure I've seen a few dakota 4.7L guys post theirs on other sites (same engine) and they were hovering around 250hp at the wheels or so.
Breathing in and out is good enough for me.