Could it be that your epub books are DRMed? Although that would make blio even less attractive in my eyes, if it could only read non-DRMed epubs. I have found epub to be a pretty bad format for my uses. It tends to display Greek text very poorly, and Greek is important for my research. So something that doesn't read anything but epub and xps isn't really helpful for me.

I would much prefer that NookStudy become available on Android. It reads PDfs and has many of the features I wish the Edge had (multiple books, multiple page mode, etc.). If I could combine the two? That would be great.