I saw one of these at the NAHBS in Indy a few years back. It was beautiful.
So I decided to contact him about building a non-tandem road bike for me. My brother had just gone through a similar process getting a custom
Kish Fabrications bike, so I kinda knew what to expect.
What I didn't know is that he basically wanted me to tell him the exact geometry that I wanted. As an avid mountain biker, I didn't know much about road geometry. I provided him with all the details I had been given from getting a custom bike fit a month prior. He eventually asked me if there was a road bike that I liked the ride of so he could just copy that geometry. I found this odd and off-putting.
I guess what I expected for the price was to utilize some of his expertise to build a perfect bike for me based on MY geometry. Lots of people can weld together a nice frame from nice tubes, give it a pretty finish, and bolt on great parts. But I wanted someone to help me get the perfect ride/fit for me.
In the end, I decided against going custom and tested as many road bikes as I could. I finally ended up with the Roubaix and have been very happy with my decision.
I'm not saying that Kent Eriksen doesn't build an excellent bike, but from my experience I would have liked something more 'custom' for the money.