I have both 6 and 7. 6 is used on an XP computer that is used only for craft programs and kept offline for safety.
I have to find a cable long enough to go to the router to update anything - therefore, 6 works well as it can sit without wanting reactivation. I have EQ7 on a Win7Pro laptop which is used for going online. I have to print color from the XP box - the laptop has a laser printer. I had 5 and gave it to a friend. I'd bought it used anyway.
BTW- you can migrate software. The XP box needed a larger HD than 20G. The tech migrated everything to a new HD and EQ6 didn't need a reactivation. Same box, so I don't feel I'm cheating.