Can't tell for sure if it is good for critical focus pulling...but sometimes people I work with miss the focus even with hd monitors, and not because they don't know what they do...it is just hard, especially on a wide open lens with a lot of movement in the frame... personally I pull focus equally bad weather it is a canon screen or red epics monitor...this is one of the reasons to have a decent playback...
Generaly, considering the price I'am happy with my monitor.