Has anyone had any experience with this Paasche Flow Pencil?

Model: FP-1/32 The FP-1/32 Inch Flow Pencil is an ideal instrument to flow lines onto a horizontal surface. Without masking or overspray, the operator can stripe models, wood products, metal products, metal parts and other surfaces needing decorative trim. Nib size determines the width of the line.
Or should I just stick with learning how to create fine lines with my AB or future HP-CS?