I got a couple of those. I like much about them but come the cold, I wonder if my 80/20 VG/PG juice will move up and down the feed tube. They are very squishy.
They are available made from both silicone and PE, so maybe the PE would work better for those in the cold winter areas.
Silicone will not be a problem for me, an advantage of living where it averages out to being like endless summer 365. I wear shirt sleeves, shorts and sandals (only when I go to town) year-round here. Don't even own a coat or long pants anymore. That after living near half my life in the deep snow frozen north. So even sometimes having near freezing temps for short periods the cold doesn't bother me, and I tolerate the 120's in the shade summers.