It has great screen resolution and brightness, making it easier to read in bright environments. (technologyguide.com)
While I appreciate the advantages of e-ink (usability in very bright environments and being eye - friendly), this product was clearly too niche to be viable. (goodereader.com)
The variable aperture is listed as capable of switching between f / 1.5, for low lighting conditions, down to f / 2.4, for brighter environments. (ibtimes.com)