I have a p95f+ and it is good. It is VERY slightly curved on the sides (looks like an hourglass) and also very slightly not square. Tiny text is also somewhat blurry. Again, these things are very minor. These are also not noticeable other unless you are running a video diagnostic. The color, refresh rates, crispness, etc are all outstanding. If the 90 is anything lie the 95, I highly reccomend it.
One last thing, like any monitor it takes around 10-15 minutes to warm up. I think this plus the minor (almost unnoticable even in diagnostics) geometry errors give the monitor a bad name.