I've never used it... I don't think I ever will. My roommate in college last year bought this and would wear it just straight on her entire lid (and thick, no blending!). Nothing else except some pink lipgloss. Shes Jamaican and has really dark skin and it was so totally distracting all I saw were WHITE eyelids when I looked at her... I couldn't handle it and wanted to attack her with mascara.
I've seen it in stores though and I think if you used it right it could look very nice.