Opinion: Is Cycles Ready For Professional Use?

Lechu writes:

Hey everyone,

I’ve recently finished a short article in which I share some of my experiences on using Blender and Cycles for professional, client based work. I thought you might be interested in reading a bit on the topic. I also hope to encourage more people out there to stick to the Blender on their daily basis.

Happy Blending!
Lechu

Do you agree with his conclusion? What do you think are the strenghts and weaknesses of Cycles?