norton IS 2009 / norton IS 2009 premier?

can some one please tell me what's the difference between norton IS 2009 and norton IS 2009 premium (other then the price)?

I noticed that the key technologies listed under the premier version are:

  • Norton™ Insight
  • Norton Disk Doctor™
  • Norton Speed Disk™
  • Norton™ CleanUp
  • Norton™ Startup Manager

    but I have no idea what they are for -
    1.well startup manager - is this something like msconfig?
    2. cleanup, is this something like ccleaner?
    3. speed disk - no idea
    4. disk doctor - no idea
    5. insight - no idea

    is it worth getting the premier version?