I'm on a red kick right now, and thought it would be nice to try a sample of a different brand of ink than I normally purchase. I initially tried my Robert Oster Crimson in my Cross Bailey, but there was a ton of pigment creep (I don't know if anyone knows what I mean by that, but it wasn't INK creep, it was pigment FROM the ink oozing out everywhere). I was disappointed, but because I really liked the color I cleaned up the Bailey and tried the Oster in my Pilot Prera. It's a match made in heaven. I do have some creep with the Prera (which in my experience with this pen is very unusual), but it's ink, not gucky pigment, and it's not much.
That issue aside, this is a beautiful, rich color. My Prera has a F nib, so I don't expect to see much shading with it, and honestly I don't think there's much subtlety to this ink in that area anyway. It's also quite a wet ink, which I tend to like and is sometimes hard to achieve with a F nib, with a pretty quick dry time. I haven't tested how water resistant it is so I can't speak to that in this review.
I have found that I have to watch what inks I put in my Prera, partly because of the F nib and partly because it's a bit finicky and can be a bit of a dry writer, but this ink flows smoothly and I never have start-up issues even when the pen hasn't been used in several days. I'm not sure I can say that about any other ink I've used in this pen except for Diamine Blue-Black.
Overall, I really like this ink...in this pen. I have a couple other pens I might try with it to see how they do. Will I buy a whole bottle of it? I'm not sure. Not because I don't like it, but because I'm worried it will have limited use with regard to pen compatibility. If you're willing to try it in multiple pens to see which it works best with and you're looking for a nice, truly crimson ink, I highly recommend it.