There are probably about 2 good TV shows on primevideo.com. Of those two, one had English subtitles for the non-English dialogue that were about 30 seconds out of sync. After contacting Amazon support, their tech support from India had confirmed which show I was referring to. This took about 10 minutes. A quick Google search found that this has been a common issue for a couple of years now, with no fix from Amazon. Conclusion: Amazon cuts corners with their business and doesn't care about quality or value.