Personally, to have a true 8i certification and therefore understanding of the technology (without any previous certification), this goes for 9i as well, I think it's important to READ the 8i/9i upgrade study books . The study books I used (SYBEX) to gain my 8i certification didn't go into the NEW FEATURES of 8i specificatally. So it was difficult to determine between old and new features.

Now sutdying for my 9i upgrade, I learn specifically all the new features. This is great, because I'm learning the distinct differences beween 9i and 8i.

I still think downgrading is plausable option. So, why aren't many people persuing it... $$$$ cha-ching I reckon. Bosses arent impressed really with gaining certifcation in old technology. But if it helps you understanding of what which version DOES and DOESNT have, I say go for it.

Cheers,