It certainly won't hurt to take the classes. There are lots of folks that use it. I have Revit 2009 but I actually don't sell any Revit work. I bought it because I had several customers inquire about it, then when I did and let them know the usual response was "well, we're not ready to make the switch yet, we were just trying to see where everybody else was".
I do use it quite a bit however to generate floor plans and elevations that I then export to Autocad. It is great for that. So far though, none of my clients are using it yet. They will eventually though. Having skills in both will definitely be a plus.