I have had my cars sent to Krown on the recommendation of my mechanic. He owns a Hyundai Pony, yes, a PONY, that is still fairly free of rust. And those cars, as you wil lrecall, rusted on the boat as they came over from Korea! That was enough proof for me. It is worth rustproofing because in The Hammer, they do not bother to plow the roads if they can get away with putting a six inch layer of salt over everything. I guess they want to save the wear and tear on the plow blades. (I won't get into the fact that they still have not shoveled the street, which is an emergency snow route. They left it all up to Mother Nature)..
It was also instructive to see that the dealership that I bought my car from sends the cars to Krown as well, so you can save yourself a wad of money by taking it there yourself. They charge perhaps $300 to have their lot lizard drive the car around the corner, when you can get it done for $100 or so directly.
And make sure you mention that someone you know recommended Krown because you may be able to get 10% off, and that will kick in every year, because the price is locked for as long as you own the car.