A friend of mine played the demo in front of me a fair few years ago. Loved the idea of flying 'big' ships (...like the Rhino.) Forgot all about it until I saw a second hand copy for sale two years ago.
Stumbled across Discovery a little while later in a search for aforementioned big ships. Finished the singleplayer campaign in a Rheinland Gunboat (Until I got stuck in a base, opted for a fighter with gunboat weapons from there.) Strangely enough I'm presently flying fighters.