Well i already placed my order for klasse aio and nattys blue, i dont mind applying every month or two, but i do want the better shine, and natty blue has great reviews on dark cars, and all my cars are dark blue paint!!
I have both and I now only use the 845. Better dirt shedding, much better durability and I could not tell any noticeable difference in appearance. Both look great.
Like someone said, you cant tell the difference between some turtle wax and fuzion after well prep work! meaning that the best look comes from prep work but my vote is hands down for collinite 845, after having done a 3 step polish and applying 845 it looked like a show car. nothing comes close to the shine and durability of 845.