i have the xl2410t and yes there is backlight bleed and its about the same compared to what i was using before (samsung syncmaster) significant from the bottom (reaches as far as but you only see it when the screen is black.
see back light bleed:
as you can see its somewhat significant but....
it makes no difference when youve got a beautiful desktop dominated by a beautiful pair of soccer shoes.
What's nice about the xl2410 is that if you have a console like the xbox 360 and you run it through HDMI. you can hook the screen up with ear phones through its 3.5mm jack. so if your parents/significant other/roommates wants to use the tv when you want game on a console. you have a nice alternative.
120Hz is fine and you get a lot of calibration adjustments on the Benq. bought mine brand new for $400 after taxes and ive had it for about 3 weeks now. 0 dead pixels. and the built quality is fairly good. the swivel adjustment makes it all worth it.
all these features made it more valuable than the asus 120Hz monitor. (and glossy screens suck)