Thunderbolt and Display Port are not the same. DP is video only, whereas Thunderbolt is video and data each in their own 10gb channel, they just share the same cable.
I've got the Quad coming this week. I need it for my Apple Thunderbolt Display. There just isn't any other option if you want to use the daisy chaining ability of Thunderbolt, which is another advantage that will most likely reduce the need for additional cables provided the inputs are available on the devices and they provide some form of a cable with their product.
USB 3.0 might be a reasonable option but I do video and photo work, not just professionally as a hobby as well, and I spend a great deal of time waiting for USB 3.0 to push data around. The only time I've been impressed was when it was pulling from my 512gb SSD to a ext. 7200rpm 64mb. But as fate would have it, I am not blessed with terabytes of SSD storage. ( I did see a stupid PCIe card somewhere that cost $200 and allowed you to use 4 32gb flash cards as a single 128gb storage. You do that math...)
The simple math for me was this: over the next year if I save 15 minutes a day in waiting time in one year that is 84 hours, at $5.00 per hour I've already paid for the cost of the board and have enough left over for the <total amount
> of money saved. Once again, you do the math.