The Advantage of Large Aperture Size
The aperture of the RAPID II is large. Very large. With a 204° capture angle in the horizontal direction, this means that you are collecting much more diffraction from your crystal during an exposure. This reduces the number of images that must be collected and scaled together. Scaling is more accurate because more equivalent reflections are measured on the same image.
The Advantage of Low Noise
The large aperture and lack of electronic noise means that powder diffraction and diffuse scattering measurements are easily made, even on small samples where long exposure times are required.
The Advantage of Simplicity
The RAPID II has a simplicity of design that means it is easy to use, so you can be less concerned about letting students and new users collect data. The 1⁄4-χ goniometer is an elegant solution for covering reciprocal space and the lack of a 2θ arm means that alignment is simpler. The RAPID II is a very reliable instrument that can be repaired in the field if necessary. In contrast, electronic detectors must be returned to the factory for repair.