Tried to respond to the survey, but everything was locked, so guess you have what you need. In addition...
My biggest problem with the 15000 is the sensitivity in the bobbin case. Doesn't take much to jam the thread.
Re software, I do not use the Horizon stuff.
Re apps, I took a class when I first got the machine and was so frustrated with the instruction and the quality of designs that I discontinued.
However, not being an Apple user, I'm learning to use the IPAD and really like the My 15000 app.