Many 27" monitors are $300. For magsafe you can just plug it into the wall socket like normal. The other ports are usb ports and I can get a usb port expander for $20.The size, Thunderbolt, MagSafe, and the other ports on the back of the display.
What is a TN panel and what exactly is S-IPS? Is there a big difference? Also, what is the difference between CCFL(What's CCFL anyway?) backlight and LED backlights.What justifies the $999 price is the panel. Most 27" displays you'll find run at 1920x1080, use CCFL backlights, and use a TN panel. The 27" Thunderbolt Display runs at 2560x1440, use LED backlighting, and it has an S-IPS panel.
For comparison, look at Dell's U2711, it's priced at ~$825, but has CCFL backlighting. For the $175 more for the Thunderbolt display, you get LED backlighting, and thunderbolt.
TN panels are of lesser visual quality using older technology. It has to do with how the colours of the pixels are made. S-IPS is currently the best way to make pixels show different colours and it has darker blacks. It is also clearer and faster responding. Example, the iPhone 4 has an S-IPS panel, while the iPod Touch 4 has a TN panel. If you look at the two side by side, you'll see a noticeable difference.What is a TN panel and what exactly is S-IPS? Is there a big difference? Also, what is the difference between CCFL(What's CCFL anyway?) backlight and LED backlights.