TCL 55R617 4K UHD Roku TV review: Great color and HDR for a very modest price

Each time I see a new TCL TV, such as the $649, 55-inch, 4K UHD 55R617 reviewed here, the company has made significant strides in one area or another. A couple of years ago it was adopting the excellent Roku operating system; this year, it’s delivering color and HDR (Dolby Vision, specifically) that’s competitive with TV’s