Robots vs. The Unseen
Drones are excellent against Invisible targets.
First, the Simsense Interface Overdrive cyberware (DC, pg. 145) is underappreciated. It's easily available, it costs only 0.2 Essence per rating point, and it adds its rating to the rigger's Intuition while the rigger is jumped in. A perception test is, of course, Perception + Intuition.
But when perceiving through a vehicle's sensors, you can choose to roll Sensors + Intuition instead. And of course you can add ultrasound to your sensor package, as well.
With the right cyberware and drone upgrades, you can be rolling a pile of dice on Perception tests. Which are used to see the Invisible, to hear targets under a Silence spell, and also to do stuff like notice hidden bombs, etc.
In fact, you should be outsourcing your perception tests to drones as often as you can.