First off, don't be intimidated by the line: we went two mornings in a row and there was a big line, but we waited only about 25 minutes before taking a bite of their Eggslutty goodness.
My favourite by far is the Gaucho sandwich. I absolutely loved the slice of real, juicy steak bathed in heavenly chimchurri sauce, embraced by a golden brioche bun. The downside is that it costs twice as much as their basic sandwiches.
Number 2-4 would be Bacon, then Sausage, then Fairfax, in my opinion. To be honest, these guys tasted good, but kind of boring.
I almost wish Eggslut could open full service restaurants, and that their sandwiches would come with a side of home style fries...
Definitely worth a try at least!