Just added the BenQ EX3501R monitor. Everything works at is should, including USB-C connection, HDMI connection, USB hubs, speakers and sleep/wake. The monitor's resolution is 3440x1440 and works at native resolution with no issues.
I use the monitor over a single USB-C cable to carry image, audio and data. I then use the monitor in 100Hz which allows me to use the USB hub as a USB 2.0 hub. My speakers are connected to the monitor's output (there is built in speakers but they're barely any better than the Mac mini's built in speaker).
You can opt to use the USB ports in USB 3.0 mode, although you will either need to set to monitor to 60Hz mode, or use the included UBC-A to USB-B cable (taking up two ports on the Mac mini). You can also use the HDMI cable but if I recall that only gave me 60Hz at 3440x1440.
I use the monitor over a single USB-C cable to carry image, audio and data. I then use the monitor in 100Hz which allows me to use the USB hub as a USB 2.0 hub. My speakers are connected to the monitor's output (there is built in speakers but they're barely any better than the Mac mini's built in speaker).
You can opt to use the USB ports in USB 3.0 mode, although you will either need to set to monitor to 60Hz mode, or use the included UBC-A to USB-B cable (taking up two ports on the Mac mini). You can also use the HDMI cable but if I recall that only gave me 60Hz at 3440x1440.