Yep, I'm currently reading my EPUBs and PDFs on an ancient iPad 3. I researched a newer solution and settled on a Kobo Aura One (or perhaps the Forma which came out only recently) running the open-source KOReader [0], which is apparently much better than the built-in app on the Kobos. But I'm too cheap to upgrade while the iPad still works.
I have an Aura One that I love (probably around 2k hours of use on it), but the PDF experience (of anything that can't be converted to epub anyway) is not good.
Based on the voting pattern at this point, I think several people may have misunderstood his last comment. He is the original person to post in support of a better phone based reading experience, not the Kindle advocate. So he prefers to carry one device, and uses his phone to read.
I've never been able to view these properly on a kindle. Well, last time I tried anyway, is it better now?