If you have a MBA, the TBD is kind of a no brainer to me (for now). First off, it cost the same as the Cinema display and adds all the ports, so compared to the other Apple option, for the same price you get a lot more.
Pros:
- Gigabit Ethernet (no way to day to do that other than TBD)
- FW800 (no way to do that today other than TBD)
- HD camera
- USB ports that work with Superdrive (SD doesn't work with other USB hubs)
- Same price as Cinema but provides more stuff important to MBA
- Gorgeous on your desk
Cons:
- More expensive than some 3rd party displays, but factoring in the thunderbolt hub it is not
- In 2012, there should be some other 3rd party thunderbolt hubs
- Wish it had audio in and out... but not a huge deal because I added a cheap USB sound card that is connected to my USB hub
- Wish it was available in matte
My prior display was a Dell 30" that was a fine monitor, but no thunderbolt and Dell is just a horrible company so will never buy from them again. I was one of the unfortunate class action victims of their business practices that led to them being sued my many states. I got some of my loss reimbursed, but no where near as much as they took.