For what it is, it's OK. But it's not a 4K monitor. Apple made a 30" HD monitor. The iMac with 5K display has 5120-by-2880 resolution — twice the vertical and horizontal resolution of the one you posted which has only 2560 x 1440 native rez, and four times the pixels at 14,745,600 compared to yours at 3,686,400. There is just no comparison. A 4K Monitor has to have at least 4K horizontal pixels by definition (although 4K TVs cheat and only have 3840). So the one you linked to is a HD standard XVGA monitor, but not what PaulR was looking for.