Transcription Services: How Accurate Are They?

I've tried temi.com and I see where pippa has built-in transcription, but how accurate are these? I'm finding that the time I spend fixing the errors I could spend that time typing the show notes and save the time waiting for transcription.

There are services that have HUMANS trascribe your show and those are much more accurate (and also around $2 a minute). The biggest problem is we don't talk like we write, and we don't write like we talk which can lead to large amounts of "cleanup" needed even when the tracription is accurate.