My old one got squished in moving. It was a Kobo Klara I got as a gift. Before, I had a refurbished kindle paperwhite 7th gen that I liked the UI of much more but didn't like having an Amazon product.
Wondering what is out there now.
My main desiderata is that it has warm backlighting and is small. Would also like better .pdf reading than the Kobo that was basically non-doable.
If you're not wedded to an e-ink display, I bought a cheap android tablet for about $50, and set it to auto run an e-reader app called Moon+ Reader. You'll have to fork over a couple bucks for the ad free version, but it's a solid piece of software.
Can probably pirate the ad-free version of Moon+ Reader, even.