I wanted to buy the Teenage Mutant Ninja Turtles (2003) series on iTunes (480p only), but after noticing heavy compression artifacts and softness in the preview videos, I decided to buy the seasons on Amazon Video, which are very sharp and match the video quality with the DVDs. However, Amazon has had this strange pricing error for the third season, leaving out the entire season pass option, and has done nothing about it. So, I decided I would reconsider iTunes, but only if the quality is great. But, it's not just this show's previews that have the compression/softness issue, but other shows like The Batman (2004). On Vudu, the previews for The Batman are very sharp and clear, whereas on Amazon, it's slightly sharper, but a little blocky. Granted, these shows are in SD, but the iTunes previews don't accurately represent the best picture from other sources. My question is, do iTunes preview videos accurately represent the video quality of the purchased TV episodes?