I've had a procharger since 2006. They have similar claims. Would bet they all do. If you are familiar with forced induction, you'll know that wot driving below 25* isn't really an option anyway. If winter operation is important, might rethink the whole idea anyway.
I think its just this type of supercharger that has that warning on them. I dont recall ever seeing this on a GT500 manual, or on a turbo setup(turbos might not have them do to exhaust heating them up(enough) quickly.
Procharger and Vortech have been around for a while with good results. Wouldn't be scared of either one. My car COULD be a daily driver. It's more if a toy though. Traction in rain and cold weather takes away from the fun.
I always let the engine warm up for 5 minutes in below 30 degrees temps with my Saleen SC. Plus I don't boost too hard since the air is so thick and the cold thick air increases the HP so much, I just build to bits of boost for zip but don't take it all the way up the rpm range in the really cold weather. Erik