Others require 1-by wood strips attached to the cabinets with the counter glued to the strips. Whatever the method, be sure the tops of the cabinet frames are perfectly clean so that there's a good bond between the silicone and the counter. Be sure the installer levels the counter with shims rather than simply hiding telltale gaps with silicone. That's because they're the weak points in the countertop. Inside corners cut on a radius and sanded to form a perfect curve, rather than a right angle.
Corners are stress points and withstand that stress better than sharp angles.
A finish that's consistent over the entire surface. Carefully examine the counter from different elevations and angles to be sure. As tough as it is, solid surfacing still requires a little tenderness. The first step is to follow the manufacturer's care instructions. Most stains and spills wipe up with soap and water.