I use Versa-Grip's for back-day (for every set of everything). they're the best fucking thing I've ever 'inherited' (dude from Canada was in the gym for 1 day and forgot them, so I'm keeping them till next year when he comes back .lol).
straps are a fucking pain in the ass to use, and I have small wrists so they hurt like hell when power shrugging 700+
on the rare occasion I did try them for db curls, I actually liked them. felt like the db and my arm were 1 solid piece. same for db laterals... don't believe I ever used them for pressing