I have/use/like/recommend it. BUT...
-I seem to be in the minority; seems that most people buy `em and then quit using them in short order
-I don`t expect miracles from it; its output might be "spot-free" but any regular water or residual dirt that mixes with it (say..from nooks and crannies) will compromise that
-Mine isn`t a nuisance since I just leave it set up in the washbay all the time (same quick-connect fittings that are on all my other stuff)
-I`d only use it with a pressure washer
-Remember to get an input pressure limiter if you have decent/high water pressure (40psi or more IIRC)
-My resin lasts a long time since I only use the CRS for a quick final rinse and I run filtered/softened water through it
-That`s good since the resin is rather pricey, even when its on sale in bulk
-Mine leaks like a sieve despite attending to/replacing all the usual suspects
Dispatch- I really do worry that you`ll spend a bundle on it and consider it a waste of money in the long run. I simply *LOVE* mine and wouldn`t want to be without it, but that`s just me and I seldom use it other than in the winter. When I *do* use it, it`s basically just for a quickie pressure-rinse touchless, I don`t use it on a regular basis when doing a regular wash. But I guess a big part of that is my water being good enough, and my ages-long drying sessions thorough enough, that spotting isn`t a big issue for me.
The idea that you can wash your car (normally) and then solve the whole Drying/Spotting issue by just rinsing it quickly/easily with the CRS...eh, I dunno, I wouldn`t expect it to work like in the ad-copy...and !oh man! the price of that resin!