Descript does a good job with RP English, but a pretty poor job with other accents (I tried it with some speakers from Africa and it couldn't produce anything useable). There also doesn't seem to be an option to transcribe other languages than English. There's presumably an internal "confidence" score that could be used to see how accurate a transcript is likely to be - if this drops below a certain threshold it would be great not to be charged for the transcript!