this might help answer some of your questions, but people have different sensitivity to plastic taste, so you'll get different opinions on that. the mighty and crafty are known for cool vapor, which
might pertain to your health (hot vapor might irritate some people's lungs). convection vapes like the tinymight generally make hotter vapor, but people report getting cooler vapor from convection vapes by using long glass stems.
troy, who did the review below, also reviewed the tinymight a while back, and I don't think I've ever seen him cough so much. it was his first review of it, so he probably hadn't totally mastered it, plus he's into big clouds, probably didn't try to figure out how to get cool hits.
one last thing: mighty and crafty are graded as 'medical devices' in Germany; from everything I've heard, these 'medical grade' vapes are the same as the ones sold everywhere.
you're probably better off with mighty/crafty than a budget Chinese vape if you're concerned about materials. IMHO.