Well it turns out I was right on the darker front - in the wrong light this can look like pure black and im sure it could give some of the "black" inks a run for their money in terms of intensity and saturation.
This is is pretty damn dark, but i still like it. I like to keep my Pelikan M600 for my "sensible ink" (usually pelikan black) but this is so dark i thought i would give it a spin.
Now Diamine purple is definitely on the "wet" side of things in the waterman expert II i generally use it in but I love the smoothness of which it flows. I was very surprised to see how wet PR ebony purple was in the M600 since I don't consider this pen a wet pen (its pretty in between).
The ebony purple practically gushes from the pen and takes probably about 45 seconds to dry. I guess this will need filled regularly at this "burn" rate.
Overall i like this colour a lot but time will tell if I get fed up of the wetness
Saturation : Very Saturated
Wetness : Wettest ive tried out of about 14 inks
Shading : Not much to note with my pen/paper combination
Overall the Jury is still out when compared to imperial purple.

ps - Deep Purple - "Burn" - geddit anyone ?
