i think if nobody on this forum is able to test, it is a little useless to talk about this. In the end only 3 things are important: can the disk be read good (quality), how long do they stay this way (durability), and compatibility.
the princo's are compatible with my dvd-player, and they can be read perfectly accorfing to cdspeed. about the durability i cant give any conclusive results cause i only have them 3 month.
My personal grade to the princo's would be a 8+ (on a scale from 1 (bulqpak) - 10 (pioneer)).
Also i got no problem buying expencive disk, but i do got a problem with paying more without getting better quality. I bought 25 G04's on advice of some ppl saying they are the best. Now i still got 23 collectiong dust.
I read about a CT test a while ago.. how recent is your test?
btw. my very very first spindel of princo's were acceptable,but alle the princo's after that are comparable with the verbatims showed above. I think the factory produsing these disc have optimalized the creation process and have done this very well..