I think there's a lot of individual physiology at play when it comes to sight preference. I can't shoot the tall 870 slug sights for crap, mostly because the front sight is too fine for my crappy right eye to pick up, especially at speed. I've played around with options for replacing the rear leaf and front post and have a couple setups that work for me, but I'd just as soon get a lopped-off 'friendly ghost' rear and a FO post front and I'm good to go. Those wide V-notch express-style sights (i.e. DEA sights) suck for me because for whatever reason, I have a hell of a time setting proper elevation with them. Mill that V into a big wide U-notch, though, and I can run it well. Go figure.
But Tim's right about the bead-only setup. It's few and far between the shooters who can run those well, and IMHO most of them could do even better with real sights for social work.