1. How well do they stay clean? (are they dusty all of the time? Or have lots of water spots?)
the dust will show up if you live on a dirt road or drive on something of that nature. they will get water spots or streaks on them like a car will when you drive on a rainy day or don't dry after a wash. but that is all true of any wheel. i like that the flat black blends in with the color of the tire. so even if both the tires and wheels are dirty, they look the same, and if they are clean, they look the same. they look good dirty or clean to me. gloss black wheels would be much harder to keep looking decent. you'd have to wash them up like every day.
2. Are they Durable? They salt the roads up here, I figure black wheels should hold up best in winter areas, but was hoping to hear some success stories.
we don't really have to salt here in GA, but they have held up well in the month or so i've had them. no scratches or anything. anything metal will eventually rust some with salt, so you can't really help that.
3. Does brake dust show up? I wouldn't think so, but I wanted to ask just in-case.
i have noticed no brake dust. i didn't on my stock wheels either though. even if you had it, i'd think it would blend in with the color.
4. Anything you don't like about them? Something I am forgetting?
nothing that i dislike. they are great.
Also, I will be getting the wheel in 16x8. What backspacing should I specify to have the wheel flush with the fender? I don't want them sticking out or recessed. I am not interested in doing any kind of spacer.
there are not many options with the backspacing. i have 265/75/16 tires and the 4.5'' backspacing made mine stick out about 1/2''-3/4''. i think stock tires are a little more narrow, so they may not stick out as far. but if you can find other backspacing, to get them closer in to your truck, get it at a higher number. i think stock is 5.25'' and mine are 4.5''. so something between those two might be close to flush with the fender.
here are pics for reference: