Depends whether you want to train it for size more or strength. I'm doing it more for strength and so I feel doing some good numbers help many things - whole posterior chain AND grip! I have a weak grip so that's nice.
If I did it light and went for a stretch in hammies then I'd feel it there more BUT I wouldn't get the same feeling in lower back and glutes. As I said, I try hump the air/bar so my glutes and lower back are very involved.
Also hamstring curls are good. Forget that they only work a part of your hammies. Many great lifters back in the day used them. GHR is good but remember people got strong before the invention of the GHR.