CONCLUSION
Perfectly Clear, while falling short of the miraculous claims, is a great tool and often produces exceptional results. If you primarily process only a few images for fine art printing then PC won't be of much use as you likely will want more control over the processing to fine tune things. But if you process images, as I do in quantity, especially for electronic display, you will find PC "The Cats Meow" (Bibble's mascot is a cat). PC provides quick one click adjustments to images that 9 times out of 10 exceed either the cameras own rendition or normal manual adjustments. Images processed using PC have depth, vibrance and are visually appealing. If you like to produce eye catching images in short order than PC will be a tool you cannot live without.
A note of caution:
PC reacts differently with images from different camera models. It is possible that PC may work with a smaller or larger degree of success depending on the source of the file and camera.
I have used PC with the flowing models:
Canon 1d Mark II N
Canon 10D
Canon Rebel XT
Konica Minolta 5D
Olympus E300
NEARLY PERFECT...MOST OF THE TIME
As I hinted at, PC isn't always well behaved and when it makes a mistake it is frequently very exaggerated with incredibly off colors and wild contrast. Images to watch are those that have strong back lighting like silhouettes. The worst offenders seem to be sunlight with strong reflections such as water. On the infrequent occurrence of this phenomena I simply do not use PC.