Unfortunately, this is the first and only tablet I've ever used thus far, so I'm afraid I can't do any first-hand comparisons! Although I hear the the Intuos series are much better (obviously, since they are higher end with higher sensitivity), and the Bamboo is a bit of a personal preference thing (same sensitivity level as the Graphire4, but the surface texture is different and some people don't like it).
You can change this in the settings! If you open up your tablet control panel, under the Pen tab, there should be a box that says "Tracking", with pen mode activated. Click on "Details" under that and the monitor settings should be there. That is, if you're using a Wacom like I am. xD
The colours on the monitors are a little different and etc, but because of my usage (drawing on one monitor, looking at references on the other, etc), it doesn't really matter to me! I'd imagine it would be annoying though if one was trying to draw or do something across BOTH monitors.
This is probably a stupid question but may I ask where the desktop image on the second monitor is from? I have the image saved on my computer but it's not nearly that large or agreeable when I try to use it as wallpaper.
It's been a rather valuable addition to my workspace - it helps a lot with my workflow when I'm drawing and looking at references or stuff for inspiration. Also comes in handy when I'm looking up multiple things for comparison, etc. As for whether or not it's worth the money though - well, it's really a luxury that one can do without and still be productive. If you can somehow get your hands on a second monitor for cheap (second-hand, sale, etc), then I'd say it's worth considering. The one I'm using was just an extra that's been sitting around the house so I decided to hook it up!