By the way, that's my mug in these clips. Although I advocate using Terran's Media Cleaner Pro, I was not paid by Terran to make this clip. I just like the product. But that's largely because we are all so used to Cinepak artifacts. With CinepakPro, the data rate is much smoother, and much closer to target.
Quality is better overall, especially in areas of fine detail like the trees.
This Eidos Escape movie, made with quality set to 50, has generally good quality, and average data rate isn't too high. However, cccasional huge data spikes prompt Duck to recommend fast CD-ROM drives. Native 16bit color gives a certain flatness of color. Data spikes are even more huge. The Basic Edition of Sorenson Video included with QuickTime 3.0 gives quite good quality at about a third of the data rate of the above examples, and without data spikes.