On its own in isolated circumstances it is not very effective but in combination with markerlights you can effectively get a whole additional turn of regular shooting in.
Remember that markerlights are now allowed to boost the bs of snap shots, so if you can get those to hit then you can make your other shots far more effective.
I've noticed that as well. Sniper teams, marker drone squads, Skyrays, and Pathfinders, all come with or can get supporting fire, so getting those markerlights in the overwatch snap shot "shooting phase" is possible. The only trick is getting those first "6's" to hit to initiate a successful markerlight cascade. But that's a whole lot of markerlights that needs to be popped off in the first volley to that cascade rolling.
Another item of note is the amount of twin linked weapons Tau gets. The new FAQ loads up Crisis Suits with twin linked goodness now. SMS comes twin linked on every platform that can take it. Gun drones are twin linked awesome sauce. And Broadsides can take twin linked high yield missile pods. Twin linked can go a long way for mass firing during snap shots and overwatch shots. Throw in a markerlight or two, and all those twin linked shots will be a bad hurt for the enemy.
I'm starting to see a use of a Broadsides missile battery w/ Early Warning Override as a decent counter to enemy air.
Now I'm just crossing my fingers for the Forgeworld Taros/Tau update. Tetras w/ Point Defence Targeting Relays.
. Now we're talking.
