Is the Hisense QD6SF worth it over a cheaper LED TV?

The QLED layer and full-array backlight give it better color and contrast than entry-level LED sets. If you mainly watch streaming apps in a bright room, it is a sensible step up.

Does it support Dolby Vision and Dolby Atmos?

Yes. It handles Dolby Vision, HDR10 and HLG, and decodes Dolby Atmos. The built-in speakers cannot produce true overhead sound, so a soundbar helps.

What is Fire TV like on this set?

Fire TV is built in, with Alexa voice control through the remote. It covers the major streaming apps, though the home screen mixes in promoted content.

Is 50 inches right for my room?

For a typical viewing distance of about 6 to 8 feet, 50 inches works well in a bedroom or smaller living room. Larger rooms suit a bigger screen.

Does it have Bluetooth and game-friendly features?

It has built-in Bluetooth for headphones and speakers. It also has an AI Sports Mode, but it is not a high-refresh gaming panel, so serious console players should look at 120Hz models.