Difference between 3 monitors

[An AFK User]

http://www.ebay.com/itm/Perfect-Pixel-QNIX-QX2710-LED-Evolution-ll-Matte-27-2560x1440-PLS-PC-Monitor-/311424248876?hash=item488254ec2c:g:200AAOSwd0BVzUKt
http://www.ebay.com/itm/QNIX-QX2710-Multi-TRUE10-27-LED-Evolution-II-2560x1440-DVI-QHD-HDMI-Monitor-/311421983600?hash=item4882325b70:g:mhcAAOSwHnFVyUK~
http://www.ebay.com/itm/Perfect-Pixel-QNIX-QX2710-LED-Evolution-ll-DP-Multi-TRUE10-Matte-27-Monitor-/262004562610

Other than the fact that two of them are perfect pixel and AFAIK two of them have included speakers, are there any differences? Also, do you guys think perfect pixel is worth it?

 

[An AFK User]

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