I like Lumin for having my university textbook pdfs all in one place and having good viewing options. However, one feature that I noticed is missing is a text to speech / Read aloud option that appears on competing document viewers. I think this would highly enhance the experience and usability of Lumin and make way for more users, not to mention improve the accessibility of Lumin. Personally, I like to use text to speech to have my textbook read aloud to me while I read at the same time. I find I absorb the information best when I can see and hear the information at the same time. Depending on your response and how other applications compare, I may unfortunately have to switch to using a different pdf viewer otherwise. Thank you for taking the time to read my request. Have a wonderful day.