[Tinwarble]

Thinking about getting a Shield for a spare bedroom with a 1080p tv. How well does the Shield do with 4K HDR files downscaled to 1080p 24p? I have read about the colorspace issues with HDR TV. How does that translate to 1080P?

 It is not that there are colorspace issues, but the main problem is that it cannot automatically switch colorspaces. That being said, this will not be ideal for your needs since it cannot do an HDR to SDR conversion so all HDR files will look washed out. 

The problem isn't colorspace swiching either, it's just that the conversion done by the Shield hasn't been good for some people.  This has been improved in Oreo, at least to the majority of  those posting about it say they see improvements.  The really issue is HDR to SDR, though I've tested and it seems mostly fine to me.  The 4K HDR test files I've played on my 1080 TV look mostly same to their 1080p counterparts.