Update: I have recanted this positive review . The problems were more than I could deal with.

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I bought a Shield, and traded up to a Shield Pro so I could have a USB port... I bought the Tivo Stream 4K for all of the auxilliary TVs in my house, I am going to sell the Shield Pro now and use one of these for the main TV.

The most important bits:

1. It has 2 USB charging ports, one is USB-C and the other is Micro-USB. What does this mean? This means if you use a hardware Ethernet port charging dongle on the Micro-USB, and then plug a keyboard, storage, or probably even a USB hub into the other. This gives you more options. I verified plugging a keyboard into the USB-C while simultaneously using Ethernet on the Micro-USB.
2. It has the full Android TV experience, and by all rights it appears as good as the 2020 version of the Shield / Shield pro, at least for the media I tried to play.
3. It has Dolby Atmos and Vision, I'm pretty sure this is the only media player device with it at this price point.
4. I can't really tell the difference between the Shield's AI upscaling and whatever upscaling this device is using.
5. Plays well with my media stack: Plex, Youtube TV, Netflix, Hulu, HBO Max, Peacock, PlutoTV and others.

The annoyances, and their fixes:

1. It has apps you can't remove or disable, locked into the first slot of the app favorites, and the "channels". You can disable this by Settings->Apps->See all apps->Scroll down to select "Show system apps" ... From this list Disable "com.tivo.tvlaunchercustomization" and Clear Data on "Android TV Home". Now your favorites and channels are editable like a default Android TV experience.
2. It has prominently placed buttons that pull up said apps. You can get an app in the app store called "Button Mapper". You can change the Tivo, Guide, Info and other buttons to pull up whatever you like instead. I made the Tivo button pull up Youtube TV, the Guide is an alternate Home button, and Info is a Menu button.

This little box is fantastic and is miles ahead of the built-in TV apps, the one Roku TV I have, and the little Amlogic / Mii type android boxes I was using in the past. It feels FAST and smooth, super polished... and it's 1/4 of the price of the Shield Pro.

Edit: Read all the comments below for some caveats, problems that have happened to others. My hardware and media profile seemed to work with these perfectly, so IMO it is worth it to see if it works with your use case before spending 3x-4x as much on a Shield.

UPDATE: I had volume +/- stop working to one of my TVs after plugging this into another display temporarily. Had to go back to a factory reset for it to start sending volume CEC messages properly. Was a PITA to re-install and re-log-into every streaming app. The are some rough edges, but hopefully they'll get them smoothed out. Even with this, it's still a recommend from me.