Having ordered Nophead’s kit, I am looking into user experiences in building from the kit. Here are few blogs that document the experiences.

Sam Kear’s Build Log – Building a Mendel90 RepRap 3D Printer Using Nophead's Kit.

Bryan Seger’s Blog – Mendel90 Build Blog

Marcos Scriven’s Mendel90 Build – Building the Mendel90

Robert Wozniak’s Mendel90 build – Mendel90 3D Printer: Mendel90 Kit Build

Last but not the least : Build Manual from RepRapWiki Mendel90 Build Manual – RepRapWiki