Thanks for the thanks Nancy857 !!
Upon the subjects of ebooks/files/ebook readers=>
When I got interested in handheld readers I found ways to try several different makes and models so as to make honest comparisons and choose what suited me best.
At 1st I could not get my hands on a really good one so I tried a cheaper LCD one, and that began what was a one-way journey away from dead-tree books for me.
When that was wearing out, I found the Astak EZReader on sale for a great price and got 1.
Holy Cow - t'was like day vs. night; from that day on I've been firmly and happily addicted to ONLY reading that way.
Along this road I also tried several others when I could scrape the $ up for them.
Relating to your mention of the Kindle, I found that as well as the Kobo to be very disappointing after enjoying the EZReader so much - mainly because they are tied to their parent company's sites, but also because I became spolied by wider format support as well as being able to use SD cards and having a common, cheap, user replaceable battery.
Sadly the Astak company dropped their ebook reader line a while back - but there are others which are nearly identical to it because they are really made by a Chinese company.
(More info=>
https://wiki.mobileread.com/wiki/EZ_Reader )
I was lucky enough to find an Amazon seller who offered a nearly identical reader for $20 a while ago, so I grabbed the last one.
The very wide file format support, great battery charge life and quick page turning are a delight - as well as being able to read on such a lightweight device single-handed with the ability to adjust font sizes and having almost unlimited file capacity - its like having an entire library that can be held in just one hand !!
This is also why I vastly appreciate when folks share EPUB files - and often when PDFs are shared I'll just use Zamzar to convert them to EPUBs as they offer more options in the ebook reader and respond much faster than PDFs ever do.
Just some info in case anyone else here is considering making a similar move - there are some very real advantages in doing so.