Hey, a 30% increase is the difference between carrying a 100 pound load in my arms and a 70 pound load. I'd definitely want that bonus at my stagehand job, it'd make carpentry more bearable. Especially given how weak I am in general.
Especially if it aided in static lift. Think of if it could lock your arm overhead, so that 20lbs item's weight is on your shoulders instead of your arms.
Never knew I wanted this. I'll add it to the list of cyborg enhancements I'd be okay with, like camera eyes, a thumb drive thumb and deployable roller skate feet.