Not to mention having boatloads of dice only gets good if you have boatloads of Limit to go with it.
Higher limit is not even a real concern since it's downright easy to come by. Smartlinks, custom grips and better weapons are the first step and if that's still not enough, then you start making called shots to increase DV and reduce dicepool. Beyond that you're getting into such narrow corner cases that it's not worth arguing about.
Would you guys have this on your street samurai once you've had a few runs?
Probably not. Getting a +1 that doesn't kick in until after you have been attacked just isn't worth it.
If that were all Synch does then you might be right. But the text does not state that the enemy has to attack
you, only that it needs to have attacked. So by the 2nd IP of the first round it should kick in and last till the end of the fight. And besides that, the perception bonus itself is worth the price of entry. All the combat stuff on the back-end is just icing on the cake. The fact that that icing will cover 2/3 or more of your combat attacks is pretty great for a kicker bonus.
Consider:
Visual enhancement 1 + Audio Enhancement 1 costs twice as much essence for 8k
Attention coprocessor costs three times as much essence for 3k
So the small monetary premium you pay is well worth the essence savings. Oh yeah, and all those other things have to be wireless ON to give you bonus dice. Synch gives you the dice without any wireless vulnerability. And Synch stacks with those other things too.