It's good. Very good, imo. It takes a little getting used to, as do all 4X games, but its nice all the same. The races are all quite different, and you aren't going to have to worry about running out of things to do in it.
As for DG, what're your specs? You can at least get the demo and try that out and see how it plays. I know, rare that there is a demo, but there is one.