I am in agreement with the other review on here about Asteroid Belt and I see why many people pick Fire Wall over this. I won't go over the synergies mentioned below again, but there is one big one that needs to be highlighted here...
Asteroid Belt + Priority Construction +Trick of Light. Playing an Asteroid belt using Priority Construction during the first turn or two of the game gives you a free-to-rez Strength 6 'End The Run' wall which is a show stopper for pretty much all runners aside Apex in the early game. Once rezzed, Trick Of Light them onto your other advance-able ice or agenda and worry not. Of course, it's a pain if you get de-rezzed, but the decks doing this are in a minority right now. I'm finding Asteroid Belt to be a real strong opener for fast advance and if you feel attached to Fire Wall, include both and Trick Of Light the tokens over once rezzed.