I don't want to get involved in a style argument here now or anything, but (personally) I think, disregarding style, that this is a great beer. So, what if it's an American IPA? I had it alongside Sierra Nevada's Celebration Ale, an American IPA of similar character, at both the Easter Festival in the Well and last weekend in the Bierhaus. Each time the O'Hara's came out on top for me. I thought it was a more complex, interesting, and ultimately tasty beer each time.
We can argue about style all we want, but at the end of the day, all I care about is how good the beer in my glass is, and I think the DIPA is terrific.