I caved in and downloaded the game last night. I love digital downloads, since you can't shop on Christmas day!
Anyway, I started out with a small generated galaxy to get the hang of things. I am still trying to get a handle on all the options, there are so many of them!
The problem seems to be that I am never too sure what a tech or starbase module or government setting will give me until I'm actually ready to get it. Also, there are some repetitive tasks I would like a governor to handle.
I've just invaded a planet (a "minor" race) to try out ground combat, and it reminds me of MOO2 (or was it MOO?): your soldiers on one side, their soldiers on the other, and they fire at each other.
The other things is that I would have liked a 3D starmap, the 2D thing is... odd.
Anyway, I am definitely not regretting the purchase, will keep learning the game. Many hours of gaming ahead...
And BTW, the Dark Avatar expansion is already available for download on stardock.com.
EDIT: I forgot, after a few hours of playing, I haven't encountered a single bug. So stable for me.