I have a recent PCM from FS1. Shipping was a nightmare — and as has been mentioned here — customer service is non-existent. Went so far as to issue me a "tracking number" that was just them clicking a pre-paid USPS Priority Mail carton. Didn't ship for nearly another week.
Having said that, my SKIM was disabled. Module still physically installed, just ignored by the PCM.
Funny thing is, I've reached out on a number of occasions and told FS1 about this thread and many others dogging their customer service. They've never once responded.
Those guys are clearly lacking in the customer service department. I'd leave them a negative review on Google personally.