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The Apple thunderbolt display is a great monitor, but it has a few quirks that mean it's not perfect yet.
I got one for a 'too good to say no to' price so I didn't head my own advice, but my advice is to stay away from this for now, as a much improved version is just around the corner.
The thunderbolt display has always used the same panel as the 27" iMac, and now the 27" imac's have been slimmed down it's time for the chunky thunderbolt display to get the same treatment. As well as the size/weight saving of slimming down the screen the next major change will be bonding the glass directly to the screen- they did this on the new imac's and on the retina macbook pro's, and the result of this is that reflections are removed by 75% but still keeping the sharp, contrasty look that a glossy display gives you. This will be a killer improvement as the 27" thunderbold and the imac are horrible to use in the day time unless you close the blinds.
The next big annoyance with this screen is that it's usb ports are only usb 2, the next gen model will certainly bring usb 3 to the table and that makes it a purchase that will last you a good few years, buy the usb 2 version now and in a year you'll be too frustrated to use them as the world switches over to usb 3 sand leaves you in the dark.
It is still a great display, fantastic colour, great viewing angle, high resolution, great design- but just remember that something better is just around the corner, and for that reason alone I can't recommend you buy one brand new or you will have buyers remorse for sure!