Okay, got my F1 set today and of course in my impulsive way, I ripped it open right away.
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Left to right: an EGO-T battery with the C8, a fully assembled EGO-W without the pen cap, an EGO-W sans sleeve and mouthpiece, and a W-mizer by itself.
Filled them both. Tried them.
#1: Juicewhore .com Maple Rum
tobacco brought forth glorious fluffy clouds of fragrant vapor.
#2: Juicyvapor .com White Chocolate Raspberry brought forth a rancid burnt-rubbery stink.
Obviously there was a problem. I tried shaking it, reseating the plugs, nada. I had to resort to my weapon of choice: a jeweler's screwdriver. I pried the silicone fill cap off and put it back. Same awful vapor. I couldn't even inhale it, I had to sniff it to be sure.
I gave up and concentrated on the good one (and also the DCT I bought for my Provari. My first!

But that's another post.) Got home and replaced the stinky W-cart with one of the spares I got from elsewhere. Much better, like the first good one. So it seems these W-carts are delicate little flowers in some respects.
On the other hand, I haven't had a leak all day out of either of them, which is more than I can say for the C8, which will go for days with
flawless performance, and then relieve itself of all liquid in what I have come to call "The Drench"

.
So it is strictly one-day-at-a-time in my search for the ultimate PV. Sigh.