I think the new Skrip, manufactured in Slovenia and sold in conical bottles, is an improvement over the older Skrip, which was manufactured in Fort Madison, Iowa and sold in cylindrical jars. I don't use any regularly myself, but it is good, non-waterproof ink. Use Amodex Ink and Stain Remover to get it out of fabrics. I have used the new Skrip happily in a pen, and I've given it with pen gifts to happy recipients.
For the full scoop,
open a window in your Web browser,
go to
http://www.pendemonium.com/, click on "Ink and Refills," click on "Sheaffer,"
and click on the two articles,
"Casey's Nightmare" (referring to how Robert Casey developed Skrip for Sheaffer in 1922)
and the Sheaffer Pen Company's FAQ about the reformulation.
Then, go back to the "Ink and Refills" page,
click on "Ink Facts"
and read the excellent ink reviews and comparisons.
Also, use FPN's search tool (with the magnifying glass icon) to find comments about the new formula's colors and behavior; most impressions are positive. Skrip's colors aren't the most "saturated" (dense, vibrant, intense, high-contrast) on the market, but they are good, and the new Skrip is one of the better inks for "dry-writing" pens (e.g., Sheaffer).
IMHO, the new Skrip is underrated, and its price per milliliter is hard to beat!