The USB functionality doesn't come without it's limitations, which for those using the 940UX's USB's functionality as it's designed for, you shouldn't have to worry about these. The list below is the USB limitations list, these are not limitations if the monitor is run in regular D-Sub or DVI mode.

1. Since the driver has to be installed for it to work in USB mode, you can not use it as a primary monitor to access DOS and BIOS screens during bootup unless connected to a video card's D-Sub or DVI connector.
2. The 940UX's USB functionality does not support 3D acceleration
3. Supported movie programs in USB mode: Power DVD, Win DVD, Windows Media Player, VLC
4. Samsung's MagicTune program is not supported in USB mode
5. AutoPivot is not supported when the monitor is rotated into portrait mode while connected through USB
6. Only Windows XP Service Pack 2 and Windows 2000 Service Pack 4 is supported to run as a USB display
7. Functionality may not work under USB 1.0

Let's talk about some uses for this monitor, as it is one of the first of it's type finding the way onto the market. When I first started researching into the 940UX there was a lot of speculation found around the internet that this would be a USB ONLY monitor. Let me clear this up, because the monitor needs to have a driver installed for the USB functionality to work, you can not run it in USB mode without first having to connect it (or another monitor) to a computer's video card to access and install the driver. Since the 940UX when run as a USB display does not require an additional video card, this is the perfect monitor for those wanting to run 2D apps on their secondary monitors in a multiple monitor system. I'm sure people in the workstation and business and stock market (to name a few), will find an extra monitor without the need to spend lots of money on an extra video card, something very handy to have! With the ability to daisy chain a group of these displays together using the built-in USB hub, you can easily add a handful of extra displays and save a ton of money by not having to buy extra video cards to power them! I've read that up to six can be run off of a single port! Hopefully in the future Samsung may release a USB-only version of this display which can be used as an add-on monitor when doing such daisy-chaining setups because that will keep costs down a little bit by not having all the D-Sub and DVI interfaces too.

Installation:
Questioning where the driver for the USB feature was on the CD, I was soon to find that it wasn't on the CD in the first place. Instead, the driver is on the monitor itself! I mentioned earlier that one of the USB streams is dedicated to the driver flash storage. The driver itself is on a flash drive that's essentially built right into the monitor itself. When you plug it in and turn it on your system will detect not only the DisplayLink device, but also a new CD-ROM device which is where the driver is located when you go to it. I presume they chose to have it display as a CD-ROM drive and not a flash drive because of the autorun functionality you can do with a CD-ROM and can't with a regular flash drive device.

I'm not sure how Samsung plans to do driver updates, but I think it would be neat if when an updated driver is downloaded if it would install itself onto this flash area of the monitor too. That way if you ever need to take the monitor to another system or place, you will always have the most recent driver on it. I'd hate to see only the first driver on the monitor, with all future drivers having to be installed from a computer after downloading.

Testing:
As with any new technology, I was very eager to test the 940UX. Seeing my desktop background come to life after installation was the first breath of relief - it worked without a single hitch and problem free. Immediately after the driver was installed, the monitor was automatically enabled as a secondary display and it came to life. No need to fuss around in the display settings to enable and set it up.

Minus the limitations discussed above, when run on USB mode the 940UX is just like any other monitor and unless you know, you probably couldn't tell it apart from a normal monitor under regular 2D operation. For that reason, I found nothing to complain about when using it this way.

Conclusion:
Samsung has a great new technology on their hands by using the DisplayLink chip in their 940UX monitor. The USB functionality opens up a whole new set of doors for those wanting to add multiple displays to a system but who don't have the resources or cash to do it by adding additional video cards at the same time. If USB-Only versions would be released in the future as "expander" monitors, then costs could probably be kept down even further. I think if they keep a solid push on this display and make sure the benefits are well known, then the right market of people will probably flock to these very quickly.

Pros:
USB display mode is an awesome new feature being introduced on this monitor
Can be used as a regular monitor on a video card if you chose to not use the USB functionality
D-Sub, DVI and USB inputs
Two-port USB hub on the left side (makes it easy to daisy chain multiple 940UX's)
Fast response time and high contrast ratio
Stylish looks and easy adjustability
USB driver is on built-in flash in the monitor

Cons:
USB isn't without it's limitations as some may dislike
No Vista compatability at this time (June '07)