No not yet. Last year I did it in Sept and felt like a dummy because we didn't get any snow until late in December. Then I stayed with that LSP until spring (Bilt Hamber Finis).
My cars are always spotless and wheels are OptiCoated. All trim is DLux'ed. Winter prep for me will be:
1. Normal 2BM
2. Maybe clay. But my cars are always clean so I never pick up much with clay if anything. Same with IronX. If I saw any purple on my paint I would probably get a woody. Only purple I ever see is around the rotor hub on my Pathfinder.
3. BMW is getting Swissvaxed. I'm going to use Rupes 15 w/ their Ultra Fine polish, followed by Cleaner Fluid Regular (will try it on Rupes 15 slow), then Best of Show. This car sees no "weather" anyway, so protection doesn't matter much.
Wax will be maintained with Swissvax Nano Spray Wax. I also picked up one of those cool little Swissvax shoe shine brush looking thingies for leather cleaning. I wish AG would carry Swissvax.
Pathfinder is getting Colli 915, preceded by the same Rupes prep or maybe a paint cleaner. This is my first time using a Colli wax. I have a new tin ready to go. Roof and bumpers are OptiCoated a few months ago, so they will be left alone. Boy, that should make the job faster this time.
Wheels, wells, running boards, and wiper cowl will all get Permanon'ed every other wash over the DLux.