@akhilrao I read mostly on the metro (needs to be super bright, black on beige) and at night (needs to be super dim, white on black) & Kindle fire works fine. Screen updates instantly on page turns. Sometimes the browser temps me. Xray/lookup works fine.
I got paperwhite gen 7 (latest is 10?), black on grey, in darkness, glowing blue/grey & black text. Screen updates a bit laggy. There are *only* books here. Xray/lookup is laggy and slow.