Have you been to their website? It sounds like a very good program, assuming you don't have to share shortcuts with all the other MTs (I read about normal reports that could be shared and shortcuts already built in, but hopefully each MT can customize things for herself. Here's the website:
http://www.hudson-medical.com/cn-transcription.htm Here's something I copied from there that you should be very grateful for: "Designed to be used without a mouse so that transcriptionists can keep their hands on the keyboard to maximize their productivity."
This is a Word-based program, BUT they understand that using a mouse is a bad thing for a transcriptionist because you have to take your hands off the keyboard. If I were you I'd ask for the list of key commands from the start, instead of first learning how to move around with the mouse.