Bought a unit of VX3209 and have tested it for a full day.
Im running the colour in native and not srgb (brightness and contrast reduced). Overall let me share some of the things i observed over my oldie U2311h.
Colour wise it cant reproduce as vibrant colours as U2311h. It is good enough for gaming and etc but you might be disappointed if you are hoping it can produce good enough colours to rival the dell. Im not that picky though, i kinda like it.
I cant get the speaker to work... not sure why. If i ever temper with the menu setting (as in add more settings; Setting higher response time and dynamic contrast) sometimes it will goes black for a while. Did i not mention i was running in HDMI mode.
The stand looks cheap but once set up it looks great (sounds confusing eh). It is a 1.2k monitor anyway haha cant ask for much.
As for gaming, I gamed on PC at 1440p with a gtx970 and PS4 pro. I didnt notice any input lag but i have only tested this with FIFA 17 and LOL.
As for movies yet to watch any but i did watch running man in 720p. It looks good but you cant put it on full screen anymore. Need at least 1080p to look good in full screen.
As i said in earlier post. Out of the box, this monitor colour is not nice. However once you calibrate it properly, it will shine. It has no speakers. Only got tht 3.5mm jack for audio out. I hook a xiaomi mibox 3 to it though hdmi and audio output to speaker is working