This product covers the iPod almost completely, which is good. It fits perfectly well, but I've had a few problems with it.
The main issue I have with it is that the thin piece of plastic that covers the clickwheel hampers the sensitivity of the clickwheel by quite a lot. For example, playing Solitaire freezes up the clickwheel quite often. So when you're trying to move it in an anti-clockwise direction for example, the iPod would not respond at all. I would have to press the enter button, and then the clickwheel would work again.
I've also noticed that it would be very difficult to clean the bit of plastic that covers the clickwheel. This area of the cover will obviously be used the most, so it tends to get a bit dirty. But since you can't remove that part of the cover or anything, it is very hard to clean properly.
Another problem I have with this case is that the bottom of the cover protudes about 2mm too much at the bottom. This means when I place the iPod in my docking station, it wouldn't fit unless I took out the universal dock on the docking station. Also, my car radio has a wire that connects to the main port of the iPod at the bottom (not the headphone jack), but it will not fit into the iPod with the case on as it is unable to reach far enough to connect with the iPod properly.
So, if you don't mind having the clickwheel being slightly less unresponsive, and you definitely know you'll only be using the USB cable/headphones that came with the iPod, then by all means go for it.
I myself have just received a new iPod nano case this morning. It is the NanoShield for iPod nano 3G - Clear made by Agent 18. It's very slightly more expensive, but the clickwheel is not covered so it's easier to navigate through the iPod. Now I can use the clickwheel much more easily and it no longer freezes. Also, it does not protrude at the bottom of the iPod, so it will fit all my various docks and wires without me having to take the cover off.
NanoShield for iPod nano 3G - Clear