I just finished this seamless jumper this morning. It's made from the E. Zimmermann formula as found in "The Sweater Workshop" but I chose the pattern and "designed" the collar myself. The colour is a beautiful aquamarine and tweed which may or may not show well on your screen. The wool is 8 ply and I used a 4 mm needle. I was very gratified to discover at the end of it all that my gauge and the measurements were spot-on. I did a simple "horizontal dash" pattern which I thought went well with the colour. I wanted to do something different with the collar; I thought that it should somehow be horizontal rather than vertical. I made the boat neck and then knitted a few rows of garter stitch. Then, I finished it off with a 2 stitch I-cord. I'd never done that before and if you've not yet tried binding-off with an I-cord, do give it a go as the finished result is absolutely stunning. It took me 3 weeks to knit this which proves that circular knitting is so much faster than flat work.
The sleeve is a semi-fitted sleeve from the book; the pattern and I had difficulties almost from the cuff. The first sleeve proved the expression that one has to kiss a lot of frogs to find the prince - I frogged the bloody sleeve back multiple times until I found a way of working it that satisfied me and didn't create nan flaps.
As you can see, I'm having a lot of fun with the EZ method of knitting. I think the most important thing I learned during this jumper is that I didn't have to treat my knitting as if it were fragile. I learned that it has lots of spring and bounce to it and that I could maipulate it as I wanted. This was especially true as I did the I-cord and grafted the last 2 stitches down as well as when I was grafting the underarm area. In fact, thanks to being more in charge when doing the Kitchener stitching, the seam is perfect and absolutely invisible.