I just started and I already know it's not worth the time investment.
I just started a few days back, and all I can say is, don't expect to make much money here. The fact is that the amount you get paid for the amount of work you do is less than peanuts. The pay rate is $0.45 to $0.50 a minute, but even if you good at typing and really good at captioning in general, you still have to sync the captions to the video, which takes up more time (It took me 2.5 hours to caption 20 minutes of a 30 minute video). The longer videos pay more, but you'll be sitting there for hours captioning a longer video. I felt drained after captioning one 30 minute video, and after going to bed to finish it up the following day, lost it due to the deadline. Deadlines are also a little annoying because you have to commit yourself to doing a video all the way through in one go, especially if you only have 1 hour to finish for the shortest videos, and rewinding the video over and over again to properly caption everything does get annoying after a short while. You'd also be dealing with bottom of the barrel audio 96% of the time, with a lot of what you get unclaimed multiple times for multiple reasons, so even if you find something that sounds alright to begin with, something can come up and you'd unclaim the video due to poor audio or some other reason.
I read the reviews before moving forward, and still went ahead thinking, hey, I'm just looking for pocket change while in between jobs, a little $15 or $20 you know? This is not the way to go about getting $20 bucks.
You're better off trying something else.