Hi Frankie,
Thanks for your reply, the company I work for finally went out and purchased it about a month ago.
File sizes are most certainly smaller than any other package I have come across, but as yet I am unable to give you the percentage, as I am still in the middle of another job that I started 5 weeks ago, with just using AutoCad to make the Piping runs etc.
I actually did the demo package you have to print out, to use, it took a little while since some of the documentation leaves a bit to be desired, but the file size was way smaller than any similar thing in AutoCad or any other package.
May I suggest you also review CadWorx, prior to buying anything yet, I went to a seminar 3 weeks ago on it and was quite impressed for the price of $3500.
Look forward to hearing from you, I am located near Toronto.
Tony