Grid is obtainable as shards from 3 different battles: chapter 3 battle 18, chapter 5 battle 6, and chapter 7 battle 6. He is the only hero whose shards are found in 3 battles, other than Multiverse Batwoman.
Unsurprisingly, he is good against any variant of Cyborg (character).
Circuit Breaker no longer disable enemy Cyborg passives if Grid is KO'ed.
Grapple Tech has two hits, a grapple that damages the current opponent, and a punch that hits the tech opponent that is forced to tag in. He can only force a tag in if the first hit is not blocked, and the punch would be block breaking. The vast majority of the damage is in the punch.
Both Drone Strike and Data Mine have a unique mechanic in which Grid emits a puff of green gas at the beginning that does no damage, but staggers the opponent allowing the Drone or Mine to hit. The gas can be blocked. Also, as the real hit comes quite slowly, it is very easy to Special block it, or, if timed correctly, dodge it by tagging or interrupt it with Dark Supergirl or Multiverse Armored Supergirl.
This, along with how Grapple Tech does negligible amounts of damage when blocked, actually makes Grid one of the easiest opponents to fight against as long as you are not relying too much on Cyborg passives. His shield can be annoying, but if your basic attacks are strong enough to trigger it, his stats would be too low to be a threat to you in general.