I have it!! I haven't knit a sweater with it yet but I have a pattern ready to go.
My LYS did a two-hour demonstration where they showed us all of the features of the program -- that was soooo helpful. It really is such a cool piece of software! If you have a good gauge swatch and measurements you can design any kind of sweater from doll/bear - kids - adult sizes.
It also keeps a running tab of how much yarn you need as you work on the pattern, which is helpful if you, for instance, have 800 yards of yarn you want to use for a tank. You can adjust the length/armholes/neckline until you reach the desired yardage requirement.
There's a yahoo group for SW users: http://www.software4knitting.com/support/discussion_group.htm ...I haven't joined, but from what the demonstrator told us they are extremely helpful and always interested to hear suggestions about the program.