LG OLED55B7V TV as monitor

Likely well enough until desktop and HUD burn-in become noticeable if you plan to use an OLED TV to display anything with static elements on it. Personally, I'd give OLED a few more years for the technology to mature some more (perhaps replace blue OLED with red/green and QDot to change the wavelength back to blue to get around the blue OLED's lifespan problem) and become more affordable.