I agree with that Steve, but it may have to be the Artist version. There were threads early on of people intending to exploit loopholes to redeem extras in the other two (this may have indirectly fed into why a "true demo" never showed). Hopefully those have since been closed, and a demo itself should have no "redemption codes" included anyway.
For folks truly new to SONAR, 30 days is not a lot of time, but definitely will allow them to use it. A 30-day, fully functional Artist version would be good for this.
From my perspective, I have purchased most things I have demo'd, so the "fully functional" carries a lot of weight.