The display on this is excellent and likely its best selling point. The display and integration with google photos makes it hands down the best digital picture frame i've ever used. I initially bought one for my kitchen as I have a very small kitchen and the size is perfect for that scenario, but upon seeing how little light it emits when it goes into its low light mode I bought another to use as a smart alarm clock. The idea of having an always on screen next to my bed seemed like a bad idea to me, but the light from this thing is less intrusive than most alarm clocks i've used. Using it in the bedroom definitely makes the lack of a camera a plus as well. Having a camera in my bedroom has always felt... unsettling... to me.
The cons of the nest hub are probably not a surprise for anyone. For me personally I have a huge audible library and not being able to use it on google assistant has always been annoying. While there isn't really anything google can do about this, it does prevent me from using the device for something I listen to every day. I could cast my audio from my phone to use it for that, but at that point I might as well just use my phone speaker. While the nest hub does sound much better than my phone, the audio quality isn't by any means stellar and listening to an audiobook is a situation I just don't really care about a moderate bump in sound quality. The other biggest cons for some people would be screen size and the lack of a camera, but for my uses I consider both of those things to be features.
At full price the nest hub is something that is worth its money if you're in the market for a smart screen. With the frequent discounts it's something that you can't believe the value you're getting out of it for the price. The two I've bought I got for $50 and $70 and honestly wish I bought a couple more of them for that price.