By "look and feel like the real Sun exam", do you mean that your simulator has Drag And Drop questions ?
I hope so... at the moment that's the technical difficulty, but I'm working on it! Let's just say you'll need JavaScript enabled.
Charles Lyons (SCJP 1.4, April 2003; SCJP 5, Dec 2006; SCWCD 1.4b, April 2004)
Author of OCEJWCD Study Companion for Oracle Exam 1Z0-899 (ISBN 0955160340 / Amazon Amazon UK )