No there is no demo for this game.
As for solid feedback, you will find that here in these forums!
I suggest you read all the topics comparing DW, to SOTS, SINS, etc. Also read all the player reviews, and questions.
So many players like you have come in the same way, demanding a demo and saying how disappointed they are with other games, I have yet to see the ones who did decide to buy DW come back and complain.
Believe me I know exactly where you are coming from, most of the 4x games that came after the masters MOO2, Stars, etc. have paled in comparison and this genre seems to have taken a step back..
However DW will not disappoint.
The Publisher (Matrix) and Developer (Codeforce) are hard at work on
a) A possible update
b) A confirmed expansion (with no details yet.)
So they have been quiet, besides Erik's recent comments stating what I just said.
BTW, welcome to the forums!!
< Message edited by lordxorn -- 9/7/2010 7:02:47 AM >