I sort of think the term "not for you" is silly; I believe we're all vapers here, and I don't believe anyone's looking for a burnt rubber taste. It's not like some are and some aren't. For there to be a burnt taste, there really has to be some sort of chemical or combustion reaction going on that indeed gives this flavor; the human tongue simply can't taste things that aren't there (unless someone's psychotic). My guess is that there's a residue in these tanks or on these wicks; a lady on this forum found the very same result with ONE of the Aspires (but not the others in her stock) and found that boiling the tanks and wicks solves the problem, however it destroys the glue components. It points to the random presence of factory residue, and with that, I believe it's a factory issue that should be solved (many are reporting it) and depending on the residue or coating and what exactly is in it, I'd question the safety of it.
My local retailer sold me a clearomizer that was practically 1/6th full with some sort of lubricant. It's simply unneeded and is probably half of what ruins many a vapers' experience. There's what, probably 20 reviews of the Aspire on this forum so far? About 5 of those are reporting the burnt rubber taste. 1/4 is not a good thing. Then again, it may be a wicking issue, maybe someone's using a thicker juice (which Phil says an air controller may help) but I've seen folks practically put pancake syrup in these things and get a great result. I just don't see how this many professional vapers are getting the bad result if it's down to the user or juice.
Retailers need to stop blaming the customers and saying something might be mentally or physically wrong with them. I highly doubt it's that. There's a big difference from a burnt taste, and someone just being picky over wether they like dual coils or RBA's better.