I bought the camera thinking (wrongly) that image quality was 90% of what I cared about. It does have a good image, wide field of view, and reasonable night-vision mode. But:
• Fundamentally idiotic design - can't save video except to ridiculously overpriced Nest cloud service.
• Browser UI requires Adobe Flash.
• Camera software (on both iOS and in browser) eventually will stall, showing what seems to be a live image but is actually a still image from when it crashed hours ago.
• Other times, camera view will gradually drift behind, so that what you see is actually several minutes behind real-time.
• You can set time zone, but only for regions (not many) that Nest marketing has approved, so when you take the camera on travels, its several hours off. E.g. I took it to Japan but the closest time zone I could set it to was Saudi Arabia. (WTF is wrong with these people? How is it possible to decide on that outcome when you have written a software UI to set the fucking time zone?)
• Camera hardware unit crashes every once in a while and becomes unresponsive until power yanked / rebooted.
• Completely unintelligent about returning to a previous location -- you have to do the weird bluetooth-and-QR-code dance every single time you bring the camera back home.
• If you don't sign up for the stupid $300/year cloud service, then you get ads for it in the UI.
• Die Nest, die die die die die. (Yes, I root for them to go out of business, even though that would mean that my stupid cloud-dependent camera would cease working entirely...)