I also knit up the Shetland Tea Shawl from A Gathering of Lace by Meg Swansen.
I used three balls of Madil Kid Seta in White, and it was very challenging. My advice is USE STITCH MARKERS. I didn't, and I had a harder time because of it. I also found the beechleaf edging was a pain to knit, but it does look nice. Unfortunately it didn't turn out big enough (the diameter was only 5 feet) and I like my shawls to be much bigger, so I gave it away to a smaller friend!