Is it OK with you that it uses PWM on lower brigthness levels?
I think, according to reviews, that 20% brightness level is rather adequate even for low ambient light levels. At least, I hope so...
I got to replace my current monitor and have not many choices: AFAIK, viable quality alternatives are limited to u2413, but it is wide gamut, and u2913, but I don't like weird 21:9 format.