Army Painter Speedpaints are a range of acrylic paints designed for quick and easy miniature painting. They are essentially a "one-coat" solution, offering shading, highlighting, and base coating all in one. These paints are designed to flow well and create vibrant, saturated colors with realistic depth. 
Here's a more detailed breakdown:
One-Coat Painting: Speedpaints are formulated to be applied in a single coat, providing a layer, shade, and highlight simultaneously. 
Vibrant and Saturated Colors: They offer a rich color palette with high saturation. 
Shading and Highlighting: The paint's formula is designed to flow into recesses, creating natural shading, and to dry with a highlight effect on the edges. 
Easy to Use: They are suitable for both beginners and experienced painters looking to speed up their painting process. 
Wide Range of Colors: The Speedpaint range includes a variety of colors, including metallics. 
Speedpaint Medium: A medium is available to help thin the paints for glazing and other techniques. 
In essence, Army Painter Speedpaints are a time-saving and efficient way to achieve high-quality miniature painting, especially for those looking to complete projects faster.