I'm loving my Nvidia Shield Pro.
I was sceptical about the AI upscaling to 4K but damn if it doesn't make my 1080p H!P concerts rips from my Blu-ray discs look that much crisper.
And all buffering issues I had on the Xbox One S in PLEX don't seem to be popping up here.
All that for a device smaller than a Nintendo Switch (it's shares much of the same DNA), and inaudible (certainly a big difference with the Xbox).
I had read it had a reputation as a 'just plug it and all your streaming video just works'. Certainly seems to be true. Netflix, Amazon, Youtube. All works.
Having recently set up an AppleTV 4K for my parents, I'd put the overall experience even over that.