I can't advise on the two products you mention, but I am currently using Ultima Paint Guard Plus. It's another WOWA product. It couldn't be easier to use and provides a great gloss, it's really slick, and so far durability is proving to be exceptional (considering how easy and quick it is to apply). Beading dropped off slightly after about a month, but application is literally about 7 minutes for my truck. If you think protection is diminishing, it's just so darn easy to re-apply. And by my saying beading dropped off slightly, I'm not suggesting it quit working or was gone. I wash weekly and see some intense weather. I've no doubt my truck would have been protected for another couple of months. But the UPGP is so fun to apply, I find myself using it often. So longevity isn't really a concern. Also, I use so little with each application-- so little that I barely even notice the level drop in the bottle. Like maybe a quarter ounce each time?? Hard to say.
It's also awesome on glass. Makes glass super slick and easy to clean. I wouldn't advise windshield use due to wiper chatter (ask me how I know), but on side and rear glass it's great. Ok- I'll tell you. I put it on my windshield and couldn't for the life of me get it off. After a month and every cleaning product I own, I couldn't even touch the stuff. It was on there THAT good. Finally, after about 4 applications of Duragloss Nu-glass, I think I have it beat.
Long story short-- it's an awesome product. For a daily driver (especially large SUV's) and those that may not want to put a lot of time into their vehicles but still want great protection, this stuff is hard to beat.
Regarding dust-- no need to worry.