Verity Stob really wrote this?
Who is this imposter, it reads like an imitation?
Also an LCD is rubbish to read on. Larger eInk Options:
Note the cheap 6" Kindle might be only 167 DPI, the latest PaperWhite is close to 300DPI?
1) 6.8" Kobo
2) Kobo One 7.8"
3) Second hand Kindle DXG 9.7
4) If you are rich ... (second hand) Sony Digital Paper DPTS1, about $700 just before it was ended at the end of 2016.
PDFs are ghastly to read, unless your screen is 1200 pixels high or more. No re-flow,