I'm with GReYArea:
I've had my davinci for ~2 weeks now and I've done the warm water wash for the straw, done 5-7 complete burn/cool cycles to 430F, etc. The smell has diminshed, a *lot*. Still, it's there. If I heat it up to 390-400 and take an empty draw with nothing in the chamber, I still taste rubber/plastic, instead of the abv/honey taste I might expect.
I *think* the taste is coming from the whip but I do share greyarea's concerns about the impure airpath (ambient air surrounding LCD and electronics.. which wouldn't be a problem, except for the fact that the unit gets really hot and heats up all the surrounding electronics). That, on top of the "food grade silicone" that just cooks the plastic non-food-grade chinese wires inside, worries me a tiny bit.
I also get the impression that the unit wasn't built to withstand all the heat it eventually ends up soaking in - the side molding, below where the top lid "latch" holds onto, has started "splitting". Instead of a |, it looks like a very very narrow V, if that makes sense. I'm wondering if the heat cycles are starting to warp the body..
I still enjoy using the vape, but that last remaining issue is what has me keeping it a once-a-day only walkabout vape. using it back to back, I seem to get headaches, but that might be placebo from me needlessly worrying about plastic and rubber fumes.
For most, it won't be an issue. For the discerning vaporist who can taste the difference between an all-glass vapor path and a whip based box, this may be a slight problem if you're anal like me, but for your average vaporist I don't think it's an issue (UNLESS there is a health issue here, which is something we cannot realistically determine without the manufacturer's help imo)
EDIT: FWIW, my arizer solo has no taste whatsoever, even drawing on 6-7 with an empty bowl. I believe part of the reason is that hot air is created at the contact surface of the bowl, and flows upwards, straight through the tube. The rest of the unit below the heater, does *not* get hot, and parts/air remain cool until drawn up into the heating chamber to get heated by the SS bowl, then passed up through the glass tube.
The davinci, there is all sorts of hot stale air sitting inside the plastic body, getting hotter and hotter (and smellier?) before being drawin into the no2 style heating chamber. The unit sits and gets very, very, very hot. I don't know if it gets hot enough to make any electronics or circuitry start reacting or changing chemically - but if I had to put my money on one, I'd pick that the davinci was way more likely to do so over the solo, just from the design and operation alone. Neither is a perfect design, but my personal opinion and vote goes for the solo in terms of purity.
