Apart from being 27" vs those 24" models, it has a low persistence backlight strobing mode built in, similar to lightboost. I would probably wait for the upcoming blurbusters review, as announced here
http://www.blurbusters.com/benq-xl2720z-anoth...backlight/

i would wait for benQ's g-sync monitors which will be released early next year.

Is it really worth the wait? I'm about to change monitor and I was gonna get that 144hz from Asus... Not sure if I can wait 2/3 months, unless that G-sync is really a must-have.

the Asus VG248QE can be upgraded to be g-sync compatible, but u need a newer nvidia card for it anyways if you didn't alrdy know.

I checked the specs and I saw that:

"Vertical Refresh Rate: 100/120/144Hz"

So no 60hz? There is a D-Sub port, does it mean that if you use that port you'll get 100hz? I'm just curious, I thought it was impossible to go higher than 60hz with D-Sub (also HDMI, excepted the version 2.0)?

strange there is not listed 60hz. guess it's mistake.
CRT can handle even 160hz on d-sub. For CRT it depends on monitor model. Some can't show 120hz@800x600. Some can show 120hz@1280x1024.
afaik LCD can't do 120hz@1920x1080 on d-sub.

Nope. It depends on cable and signal type (and transistors in monitor/GPU). Check

https://en.wikipedia.org/wiki/VGA_connector
http://www.tomshardware.co.uk/forum/275916-33-notice-difference

VGA is capable of 400 MHz signal bandwidth, so it can play (all progressive, Timing-Standard: CVT/CVT Reduced blanking - yet it's designed for LCDs and i am not sure if RB is available for VGA): 2560x1440px@75 Hz (398/303MHz), 2048×1536px@85 Hz (388/300MHz), 1920x1080px@120Hz (370/285MHz).

Anyway we speak of a x-hundred $/€ vga cable compared to the cheap digital cables to achieve such rates. And managing color & co on such bandwith will still be quite dificult. And if possible i would prefer DVI-DL/DP(1.2 with 4lanes) over VGA (/HDMI if 1.4).

I also believe 60Hz will be possible, i guess on all inputs. Yet it may be some inputs won't go below. On my current XL2420T just VGA/HDMI1.4 will archive 24p while DVI-DL/DP1.2 will start at 56Hz (Vert.).

What would be interresting, that zb0t already mentioned - will it be HDMI 2.0 instead of 1.4a/b? That would be nice to achieve such rates on output-devices with HDMI only.