The tower is actually two separate pieces that sort of click together like a toy. The top houses a clear, multi-functional top/base coat. It's glossy and quick-dry as a top coat, supposed to be great as a base coat for adhesion. The color coat includes "unique" polymers that render the product flexible and durable and UV blocks to keep the color true. Both base/top coat and color coat are said to be quite long-wear. The formulas are both Big 3-Free.
Cost - $22.50 US
The Nina tried Solar...
Color: A Cardinal red cream; red on the orange side, but barely. Surprisingly flattering on The Ninja's cool, pale skin. She liked it a lot! The bottom picture is the most color-true; the others read a bit more orange than in real life.
Application: Smooth! The base and color went on quite nicely. The base coat was easy to use, as was the color coat, which was almost 100% opaque in one coat. Two coats were used to maximize the color, though, in these swatches. The down side was the top coat, which bubbled slightly and also took a long time to dry. "Quick dry" is a bit of a fib, at least in The Ninja's tests.
Packaging: Since the top/base snaps of of the color bottle, it wasn't cumbersome to use. The bottles were both comfortable, too, though the brushes were fairly loosey-goosey so those who like stiff brushes won't be too happy with that. The Ninja was a bit worried the part where the bottles hook together would be weak or, frankly, cheap. It's not. She can't imagine a situation where she could crack or break it.
Wear: Like iron. The Ninja tired of the polish 4 1/2 days after application an when she removed Solar there was only minimal tip wear. Kudos!
Final thoughts: The Ninja would buy these again, but is a little put-off that they can only be purchased in sets (color + top/base). It strikes her that she will have a lot more top/base than she will ever need...
Other notable shades in the Np2 line: Unknown, because the pictures on the site are such that it's very hard to see what color you're going to get. :(