I had these in my old Corolla (which are notorious for their awful head lights) and noticed a huge difference in output over the old Sylvanias in it. The light was much clearer; they won't look white, but they have a lot less of the yellow you expect from standard bulbs. However, as the packaging says and I was warned, this comes at a cost; they are shorter in life than your normal standard bulb. They are really pricey though, and I'm not sure they're worth the premium over the normal Silverstars.
I'm probably going to put GE Nighthawks (not the Nighthawk Platinum) in my truck because I've used them for smaller bulbs with major improvements and they seem to be a nice mix of value and brightness while the reviews I've read mention no major shortening of the bulb's life span.
If your head light lens is cloudy and reducing output you may want to consider using a kit to polish it before changing bulbs, though these have varying degrees of effectiveness; the Turtle Wax kit I used cleaned up my Corolla and my father's Suzuki very nicely, but the Corolla has a lens like the Dakota, and after about 4 months it seemed to be starting to cloud a bit again, while to compare the Suzuki (which simply has a clear plastic lens) is still clear. It will eventually cloud up again no matter what kit you use, but some are better than others depending on the amount of cloudiness they get off in the first place and the sealing compound they use. The composition of the lens itself is also a variable.