For those of you who know I am, you are in for a special treat. When I first started playing StarCraft II, I was too slow to hold off Zergling rushes. I never got to play any games because I would constantly get rushed. So, I would make my main expansion into a Planetary Fortress. Eventually I would get better and learn how to play. I still use the PF, I think it is a very underused unit/building, it is part of the way I play.
On my stream earlier, I was playing FFA's. I have only won a handful, but I have been contemplating a PF in main expansion FFA strategy. I tried it... and it worked.