I've had mine for a week now. The only juice I've gotten in my mouth is from condensation in the tip. The surface area inside is pretty large, so when the drop finally forms...it can be big. I wipe out the tip with a tightly rolled paper towel every time I refill, and since I haven't got a drop in my mouth. I've got 4 of the 5 I bought going right now, one of SI ry4, one of BWB ry4, one with Mom&Pop's famous 5 layer and one with Mom&Pop's butterfly bait. I retired the first one I was using for the SI ry4 after around 20ml or so. It started having some wicking issues like threadkiller above, burnt taste if I hit on it too often. I did have one leak while it was off a battery. It was my fault, as I didn't screw the top down all the way.
I dissected the one I retired to try to bring it back to life. The procedure is exactly the same as in the stardust re-wicking thread. I didn't rewick, but I did clean the coil/wick by burning off the coil gunk until it was totally clean. After reassembly it just wouldn't taste right again. I'm pretty sure it's my cleaning method, as I have had little luck bringing atty's back to life over the years. I tried it out on my 78mm manual after checking the ohms (which hadn't changed.) The flavor was nasty, and I never got it to taste better. Some diy wicking and coil materials seem to be in my future, but 20ml before retiring seems pretty good value for a chain vaper like me. I may have gotten even more if I had done any cleaning at all, say a rinse every 5ml or so.
I've noticed some of them have a primer taste when they're new. I'm pretty sure there's no primer on the wick, but opening a new one I usually see some fluid on the mouthpiece. I'm pretty sure it's some kind of lube for the O-ring on the mouthpice. If I had to guess it's probably straight pg, which tastes pretty nasty to me. Some of them have quite a bit, and it's possible it drips down onto the wick during assembly.
I'll definitely be purchasing more. Big thumbs up.