Once plugged in and set up, the UM-740 worked as we expected. It can be set as an extension of your main LCD, either to the left, right, above, or below. In each case, in order to use an application on the display we only needed to drag its window from the main display to the UM-740's screen.
In addition, the mini monitor is able to mirror your main LCD display. There isn't much use for this, though, since it max resolution is only 800x600. As such, it can only display a portion of our main monitor's 1,920x1,200 resolution. You can rotate the UM-740's image left, right, or upside down. The Webcam proved useful during video chat sessions where we had the small monitor display only the Web chat video. It's important to note, however, that the Webcam will not rotate with the screen; you will need to use the Webcam's software control to rotate it separately if you don't want your image to look upside down or sideways.
The touch-screen function of the UM-740 worked well, too. You can choose to control either the UM-740 itself or the main screen or a potion of the main screen. When the first option is not picked, the UM-740 will work more like a mouse: you move your finger on the UM-740 screen to control the mouse on the main screen.
Each time we changed the touch-screen function's area of control or rotated the UM-740, we had to recalibrate it to get it to work correctly. The calibration process was easy and involved consecutively touching the four cross-shaped dots displayed at corners of the controlled area. We did notice that once in a while it took a few calibrations for the touch-screen function to work correctly again.
Though we didn't test the UM-740's image quality thoroughly like we do with other regular LCDs, it was easy to spot some image flickering when looking at a bright screen. The flickering gives the impression that the screen is vibrating at a high rate. Still, we found the UM-740's display quality acceptable especially for such a small screen although we do wish it were a little brighter.
Overall, we liked the UM-740 for its portability and unique features like the Webcam and touch screen. The $200 price tag is just asking too much, however, for what you're getting. Hopefully the price will come down soon. In the meantime, check out the UM-710. It's virtually the same thing, minus the Webcam and touch-screen functionality and it only costs $130, which is still a little too expensive..