Not a whole lot. They have some very good practice returns to get you orientated, are very quick to pick up the phone, won't let you go until they get the problem resolved, (in my case I was the problem and when we both figured it out had a good laugh!). I do not think you will be disappointed! I too held off because of the learning curve, but what may slow you down a bit in entering you will more than make up for it in the speed of the program. It loads instantly and not once has it even hiccupped!
I haven't done a complete season with it yet, but I am looking forward to it and am not disappointed so far! As far as a learning curve, I figured this year even with ATX we were going to have a learning curve so why not start totally new?
Also on the Drake part of this board, they are eager to help and very quick to respond. After all how did we all learn ATX? It certainly wasn't because of a user manual. We learned a lot on our own and asked help from others. Believe me when I say that will not change if you switch to Drake!