This AI is a whole lot smarter than the last versions. v5.5 would just run back and forth outside your base if they think they can't take out all of your defenses and it never defended any of its expansions and basically just turtled. v6 actually seems to try to control the map a bit and will withdraw to a safe spot if they're unable to win the battle. It kept up with me quite well in the beginning but fell behind in mid-game and I won in about 15 mins. I'll probably play it a few more times and then see how i fair against the cheating version.