Jennifer asked in my comments why this seems so challenging to me . . .
Well, if you've seen the graph for this, it's about a 100 row repeat, with no regular pattern. So while is is fair isle, it's not your common everyday type of fair isle! It definitely will take much more keeping track of. I've actually started a sleeve to see how I like it and I do like the pattern, but my gauge is way off. Will post a picture on Sunday.
So, I take it no one wants to knit along. . .