The freelance workforce employed by Rev must pass stringent tests before being accepted. Bear in mind that after commission, their payment is very low. Basically, you download your to be transcribed, translation or captioned text of video and Rev takes it from there. Quality seems to be high. At just over €1 per minute for verbatim, time-stamped transcripts this is a cheap service. As most of their work force is based in the US, make sure you let them know if you want a UK English version.