I bought their products but wouldnt do it again. You dont own the software so when your time expires the program does too. If you want to go back to prep for something you would have to rebuy it again. Dauntless has a much better interface and you own it for life. Sheppard air is hard to upload and u have to use their password/signin everytime u use the program. I was shocked how awful it was. No explanations either just tells you to look at FAR # blah blah. I rate it a 4 out of 10. Try Dauntless next time to see the difference.