well I never really pay attention to the reaction time on the paper and just go see the monitor directly.
I see or recognize no ghosting on U2312HM using ME3 (Mass Effect 3), I guess that is enough for the reaction time issue for me.
Although, I won't be choosing IPS if I want something fast.
Both ASUS and Dell use LG IPS panels, if I understood it correctly.
I see no big differenceon image quality from U2312HM and ASUS MX239H (I am not pro or my eyes are not good enough)
That is why, I wrote only looks (ASUS) vs ergonomy/function (Dell)
I must admit, ASUS MX239H is extremely pretty and hard to resist
My U2412M (16:10) will come in the next few days.
I was also considering at the start only U2312HM or MX239H but I fell in love with U2412M better