I had N. hamata in precisely the same environment as my rajah and lowii seedlings are presently in (and the rest of my highlanders, most of which are plants with much less of a reputation), and hamata slowly choked while the other two thrived. What I'm getting at is that with most of my plants, when they don't like it, I have weeks or months to correct the problem. N. hamata just flat out died on me - no second chances, no indicating symptoms, just a steady, systemic decline. While providing it with the correct conditions doesn't seem a whole lot harder than any other plant I grow, it does seem a little more specific in its needs, and less forgiving of mistakes. (Which surprised me, because I thought hamata was one of the species more well-adapted to stressors like low humidity - hirsute, thick leaves, etc.)
~Joe
PS - In response to Pyro: In the case of CPs, I'd agree with you. But have you ever grown a Sanseveria? That's my idea of a bombproof plant; if a bomb goes off next to you and you're hospitalized in a coma for six months, there's still a good chance that your Sanseveria will be waiting for you when you come to. I used to let them go for four to five weeks at a time, but I think even my toughest Neps would be ailing after more than a month or two without water.