Are there any disadvantages to Polarization Directed Lenses?

To operate as efficiently as possible, the lenses require the incoming light to be circularly polarized. This requires extra care in the setup, and potentially additional polarization optics in the optical design. Also, the lenses function as a grating, and thus have significant chromatic aberration when used with broadband illumination. Care should be taken to limit the spectral bandwidth of the illumination for optimum results.