Originally Posted by Atomic Walrus
LB 2D is really impressive. It's like playing on a 120hz CRT, colors and black levels aside. Of course you'll need to be able to maintain near 120 fps (even higher is better) to really get the best effect out of it, but if you can then you'll have incredibly clear, smooth motion. I have LB on right now at the desktop and I can read entire forum posts while moving the window around, it's that clear.
I believe that the VG248QE and XL2411T are the top performers from everything I've read. The XL2411T is supposedly the exact same panel. They both have an extremely short stobe time (1.4ms) and are the only 1ms GTG-rated monitors out there at the moment. What that means is that you'll minimize ghosting of previous frames and blur. I believe the XL2420T is an older model that has a 2ms strobe and rated GTG time, however the XL2411T seems to be difficult to locate depending on where you live.
The fact that I'm having backlight bleed problems and still recommending this monitor should tell you how good the LB motion is. I can't specifically speak about measured input lag, but it feels nonexistent. It's definitely better than my 1440 IPS, but part of that is just down to 120fps vs 60fps. At 60fps, even with 0 processing lag (impossible) you can still have to wait up to 16ms if you hit a key just after a frame renders (because a new frame won't be ready until 16ms later). At 120fps, the potential frame lag is down to 8ms. Processing lag is an unknown until someone actually tests it.
I agree that it's insanely bright in a fairly dark room. At 0 it would still be pretty stressful to the eyes without some lighting to balance it out. And at any of the lower brightness settings (0-30) I find the BLB to be extremely minimal, as in I have to actually hunt for it to find it. If I go above 30 it starts to become more apparent. I have an old TN Dell monitor I put side by side with this one for comparison, and a setting of about 30 is equivalent to 100 on the other monitor, so for all I know every TN panel monitor would bleed if it had a sufficiently bright BL.
It's not actually caused by LB, but unfortunately LB only operates with the backlight at maximum. You can turn down the "LightBoost" setting but this only decreases the length of the pulse (lower is better for cleaner motion), so you're still getting hit by super bright pulses that will apparently expose any BLB the monitor has. I could also just have a particularly bad panel, which is why I'm trying to get some feedback from other owners.