I just finished my first try at Oliver + S. I made two coordinating jumpers for my two daughters.
http://www.flickr.com/photos/pcampbell/8517902235/in/photostream
http://www.flickr.com/photos/pcampbell/8519013384/in/photostream/
I've admired the pattern for years, but I only recently took the plunge and bought a few. I am mostly happy with how they turned out. I was very careful with my measurements, but the dresses fit like a glove and I was hoping for a little more room to grow. Lesson learned. I am also super proud with my first buttonholes on a garment. I am less proud about how I can see the transfer lines in yellow wax showing through the fabric if I look closely. Lesson learned there as well!
Overall, this was a very satisfying project and I can't wait to make more. However, it is slightly cost prohibitive. There are so many wonderful fabrics out there, but they are all so expensive! How do you all do it???