Yes, I am running it right now. No, it wasn't much trouble to change over at all. All I had to do was go to the Bernina web site and download an update that I hadn't done yet. If you are intimidated, go onto the Bernina web site and read in the FAQ section about it.
When in doubt ask Win 7 to simulate the system you run the software successfully the last time.
Windows 7 can act like f.e. XP if you want.
I run my "old" programms this way, works fine.