Alright, I spent about a week using a couple of the inks that I have gotten samples of and I really like the inks that I ordered.
KWZI Violet #4 is an incredibly vibrant and retina searing ink. I really love it. Very Bright, REALLY stands out from the paper, incredibly enjoyable.
KWZI Violet #2...I've had some weird issues with this ink. It's a purple ink yes, but I've been getting changes in color when using it in some of my pens. I don't really know why, it could've been some left over ink in the feed. It seems like the color has now become consistant and its a nice blue toned dusty purple. You can actually see it as a blue-black ink actually.
Diamine Deep Dark Purple - I was surprised by this ink. I usually don't favor red tinged ink, but I actually like this ink. There's a lot of shading in this ink, going from purple to dark purple to black. It really grew on me after using it for a while.
I haven't tried out Organic Studios Roosevelt's Midnight yet so I'll try that soon enough.