Outstanding quality and excellent value for money. You get a 27" display -- which alone is a big deal -- plus a Thunderbolt Hub, with USB, Firewire and gigabit ethernet. On top of that there's a FaceTime HD camera built-in, and a 2.1 speaker system. If that's not enough, there's even a power line for your laptop, so you don't need a spare adapter for your desktop setup vs. your bag. Lastly, the screen has a built-in ambient light sensor so it adjusts itself accordingly, saving on power and (more importantly) reducing eye strain.
All connects to your computer with a single cable. Simply awesome.
Solid build, outstanding image quality, all up a highly recommended purchase. Getting a standalone monitor and all the extra hubs and converters would amount to the same, if not more money, and would just add an unnecessary clutter of cables.