Ought to be some sort of free trial, like transcribes 10 seconds of a file for free to show you that it actually works.

I absolutely love the product. I use it every week to transcribe all of my audio. It does it with great precision, and the dictionary feature is constantly making their algorithm better. I've made an entire review on YouTube if you're interested:

After using this a while now, I've discovered how essential it can be! Very solid speech recognition. I've been using it to transcribe notes and meetings as well as video captioning. What I love about it: It works very well. The UI is simple and it's easy to understand what you're doing.