BENQ released V2 firmware at gaming.benq.com/downloads for Z-Series monitors.
Older Z-Series with V1 firmware do NOT support Blur Busters Strobe Utility.
Monitors obtained from these sources work with BENQ-authorized 3rd party utilities including Blur Busters Strobe Utility.
This is the difference between the BENQ monitor models:
XL2411Z: 24″ budget model, one DVI input, one HDMI input, no DisplayPort.
XL2420Z: 24″, includes S-Switch controller, DVI, DisplayPort and 2 HDMI inputs.
XL2720Z: 27″, includes S-Switch controller, DVI, DisplayPort and 2 HDMI inputs.
XL2420G: 24″, same as XL2420Z but includes G-SYNC.