In my experience, Hamptons have been hugely overpriced just about every time I've considered a stay at one. In fact, I consider all Hilton properties to be to expensive, but that doesn't mean I wouldn't consider one if they did actively compete pricewise with HI/HIX. I haven't stayed at a Hampton in years and would like to see how they compare to HI/HIX.
That said, I am very happy with Priority Club and 90% of ICHG properties and HH would have to do a lot to convince me to move business to them.