This was a fairly fun little 6 player FFA on Pavonis. I was playing as the Imps. Things were going pretty well until Eldar and I were the last teams left. I should probably mention that I had half the map Lped with Hqs etc. While he had only 1/6 (I think). He managed to crush my army fairly quickly and proceeded onto on of my bases. I rebuilt and went for a base trade (the only way to win with the MASSIVE resources floating around). Of course I forgot about the Eldar cloaking + teleporting bonesingers + Webway tactic meaning that despite having a far superior econ I couldn't find and eliminate his buildings and eventually just had to quit.
Anyway it seems pretty imba now. In WA I could use the assasin to look around but the scanner is no use unless you know where his base is and psykers have a very short vision range. The only was I can see to beat an Eldar late game is to slowly cordon off the map with turrets which is incredibly time consuming and he could just teleport past them anyway.