I love mine. I have two of the models and aside from the first one having a yucky tasting head in it, after I changed it, they both are great.
Watch out, you're fixing to whirl up a storm by claiming one of the heads has a bad taste. Be prepared to be called a newbie who must be
vaping it at 4.8 and has a messed up tongue.
Sadly, all 6 of my heads tasted absolutely awful, and the awful taste was very different depending on which juice I used. Salt, fish oil, metal, charcoal.
This thread seems to give a lot of light to how this can happen -
http://www.e-cigarette-forum.com/forum/ecf-library/133998-how-fix-bad-taste-new-atomizers.html
I didn't wash mine in alcohol because I'm still on the fence about vaping alcohol. But if I come across Aspire heads again, I won't touch them without trying an alcohol rinse out. It was to the point I just felt like I was vaping something really unhealthy and I can't push myself to keep vaping it if that happens.
The mystery is that the Aspire heads didn't stink up a room - they produced great
smelling vapor. All the other devices I've ever tried that have failed me did stink up a room though, so I do think that factory reside is something that isn't given enough light on the forum. Also, like the thread above says, especially with heads that have so many component materials it's unreal, things can burn that aren't supposed to. I noticed in two of my heads that with the top wick, one end of the wicks didn't sit "in" the hole that's created in the center mesh tube, but were folded down into the tube, as though they were jarred out of place. This could have had a chance of preventing as good of wicking. I noticed that another had a coil that was dangerously close to the center mesh tube. Overall, they weren't as pristine inside as I'd have expected.