Unlike the base version with "-" health, allowing the damage to pass through to the investigator without breaking composure, this version you need to protect it from damages as well since it has 1 printed health.
But has Leather Coat, etc. and soak Item tricks like Scavenging, I find it much easier to protect than e.g. Moxie (3) on where they tends to fail treacheries and take horror hits breaking the composure. Added with an option to spend more naturally enables more Scavenging to continue protecting it.
I found that 4 is useful in Standard since 2 shroud locations with high clues are abundant in this game. Looking through those who could take Lv. 3 , it seems only Wendy Adams is at 3 waiting for that critical +1. I have tested and it improves her neutral investigation a lot. (As well as granting 5 to be really solid against treacheries.) She can now also Scavenging without dedicating a hand slot for Lockpicks.