By that I mean, they let the student live in aq hotel, eat meals with the instructors, take the exam twice or three times a day, and coach them on the areas missed. Instead the linux cert programs are more like the Novell cert. You really have to understand the stuff.
Training is another area, entirely.
Some do it well, some do it poorly, almost all charge. The RedHat ExamCram, I believe an O'Reilly book, is not especially RH-centric and teaches a lot of useful things fast if you are already an engineer. A lot of those folks are either unable to assess resumes or are bone-headed enough to believe in certificates, regardless of their true worth. FWIW, I have no linux certificate.