Sure isn't doing anything for my lats, and my lats grow really fast. It is doing a little for my traps, which are a slow grower for me, so for some people maybe they're fantastic for traps.
They're making my abs look better, which I didn't expect when I started deads just a little while ago. I can really feel it on the muscles on the sides of my ribs and a bit in my obliques too, I think. Anyway, even though I've been slacking on the ab work lately, and even eating a lot more, my abs look trimmer, I think because they're set off by growth to the side of them and of the small muscles connecting to the ribcage.