I've been using both the ICE wax and the spray detailer for about 3 months now. It sure works for me, very well. I've had no problems using it, but the first time I think I used too much in the application and it did not seem to dry very well. The next time I used it, I used just enough to be able to see some of it on the paint finish...did the whole car, and then came back to buff it down with the microfiber towel beginning where I had started.
I use a California Duster daily, and then use the detailing spray to get any "road dirt" stuck to the finish off between washings. The best part is how well it works on rubber/plastic trim, like the moldings and mirror housings without having to slow down to keep it off of them. ICE leaves a nice even shine on rubber/plastics that seems just as good and nice looking as the specialized trim products do. According the the FAQ on the Turtle Wax website, it should last 3 to 4 months. That is fine by me since it is so easy to use (not much more work than drying the car off twice--application and wiping) that I use ICE wax about once a month.