I hear stuff about them being powerful. But most of these are in the context of casual games.
How have you seen them fare in tournaments or against competitive lists?
Say Kenkirk Soontir?
The problem i have with 4 sigmas is that its a very blunt instrument. if you ahve 2 sigmas vs soontir in the endgame, you still lose. Esp since if 4 sigmas, you dont have intel agent. You'd ahve to actually plan the whole game as a blocking fest to try and hit soontir. otherwise, arc dodge all day.