Pros
I've been working in Go Transcript for about 7 months now. The first month, I worked as a transcriber but after that, I applied to be an editor and got accepted. When it's not the low season, there's usually ~1000 jobs to transcribe, and even in the low season, there's still some jobs that pop up here and there. As a transcriber, I can say that editors are quite lenient to any mistakes that you make, but as an editor, the reviewer are really harsh.
The rate is pretty okay (in my country's standards, anyway). It's nowhere near what people in the US or UK would make in a standard job, but in my country, it's really good. It depends on where you're from. I usually average about $100 a week, if it's a good week. The highest I ever got was $150, but I've gotten some pretty low income weeks as well.
The good thing is you can work any time you want and however much you want. There is no minimum or maximum quota. As long as you have good internet connection and an okay device (laptop, tablet, etc), then you're good to go. Just be sure to read and re-read the guidelines over and over again, as the entrance test is pretty hard.
Cons
As I said, if you decide to become an editor, you will face really harsh remarks from reviewers. 5 corrections from a 40 minute file will get you a rating of 3 (out of 5 stars). If you get an average rating below 4.5 (even as a transcriber), you will start getting wait times and you'll have to wait a certain amount of time to pick up jobs when they are posted. Those with higher ratings can pick them up as soon as they appear in the jobs board.
Also, their support team for transcribers aren't that helpful. Many times, I've asked a question and they either don't give a relevant answer or they re-direct me to an unofficial facebook page. I stopped asking for their help after a while and just go straight to the facebook page.