If you received an early BENQ XL2720Z unit, there is a bug in BENQ Blur Reduction where the strobe backlight flashes too early in the LCD scan-out.
1. Enable BENQ Blur Reduction
2. Go to www.testufo.com/blurtrail
3. Select Height -> Full Screen
4. If you see the image below, you have the bug:
Image may be NSFW.
Clik here to view.This will cause double-image effects in the bottom 1/3 of the screen during panning/strafing/turning motion (such as www.testufo.com/photo) . The good news is I have told BENQ about this, and BENQ is fixing this issue for subsequent shipments of XL2720Z (with a utility), and may be fixed via a firmware upgrade (info forthcoming).
Note: This is one reason why the Blur Busters review of the BENQ XL2720Z is delayed.