I work for the company that produces it, and it is an amazing dram (although I would say that wouldn't I???!!!), we also produce Laphroaig, Bowmore, Ardmore and a load of others, but I'm much more into my non peated,and Auchy is perfect for me. (You should also try the American Oak, tiny bit more sweetness / honey - lovely!)
The difference in spelling is down to the Irish and Americans trying to differentiate themselves from scotch back in the day when there was some very very ropey scotch being sold around the world when Ireland and the USA where starting to export.