The aspect ratio has a huge impact on your ability to work in different environments, e.g. an IDE, Photoshop, Excel, etc.
16:9 simply doesn't make sense for much except movies. It's not good for reading web pages unless you read in portrait mode, and even then, most web pages are made for larger (wider) resolutions, so they're not very good at that unless you're well into the 2400+ pixel range (height), which also puts you in the stupidly expensive category.
In the end, 16:9 wastes screen real estate as much is put into peripheral vision.
4:3 is a very good aspect ratio as it is closer to the actual human field of vision/attention.
This monitor will probably find its greatest use with Excel jockeys, though I expect that it will also be popular with anyone working in multi-windowed environments, e.g. stock trading.
Here's one way to think about it...
This monitor takes advantage of wasted vertical space. How much space do you have between the top of your monitor and your ceiling, and just how much wider could your monitor be on your desk before it crowded out other things?
With 4 monitors on my desk, I have exactly zero room horizontally, but lots of room vertically, so using that vertical space would be a serious boon.