Hi Dave,
Yeah, why not. I've had a listen to your stuff on mySpace, and I can see it working on Bleeding Sun or Temporalcide, played in the upper registers like a death wail.
What you get for your money is a pure clear voice that will slice through the loudest thrash like a violin or the ghost of an opera singer.
The easiest moods to evoke are melancholy, spookiness and 50's sci-fi. Slap a delay box onto it for effects!
With regards melodic playing, that depends how much time you are prepared to spend mastering it, but if you are ready to make the effort it will give you total control.
To get some idea of the diversity of the instrument's capabilities, drop into my mySpace http://myspace.com/beatfrequencyuk and click on my top friends - they are all the biz!