All your questions are answered in  OSCP forum.

Copy/Paste from the OffSec site:

Prerequisites
Pentesting with BackTrack is an entry-level course but still requires students to have certain knowledge prior to attending the class. A solid understanding of TCP/IP, networking, and reasonable Linux skills are required. This course is not for the faint of heart, it requires practice, testing, and the ability to want to learn in a manner that will grow your career in the information security field and defeat learning plateau’s. Offensive Security challenges you to rise above the rest, dive into the fine arts of advanced penetration testing, and “Try Harder”.

alucian: i dont agree with you (fully), CEH provides a good basic when you are new to security, or ethical hacking in general. OSCP takes you into the deep trenches where you will learn things that are completely out of scope at CEH. You can't compare the two even the slightest.

I like that idea, that is what I am going to do got the books just have not put the study in yet trying to get a few other certs out of the way first.