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I read all mine on the Kindle - most of them are old O'Reilly books that I was able to buy in PDF form, back in the day. Never found any PDF that doesn't render; your milage will obviously vary if you're downloading a lot of PDFs from other sources.
I like the Kindle because it's so cheap, its practically disposable, and almost indestructible - I particularly like that fact its a one-task device, when reading on a phone/table/laptop, I find the temptation to switch task and start doom-scrolling websites too high.
Sageru, because most people don't like Kindle.