It's difficult to sum up the CoolerMaster U2, as it doesn't really stand out as an outstanding product, nor does it do anything terribly badly or wrong.
The noise is one of the biggest annoyances for me. My Vaio is fairly quiet, but is by no means silent, and the U2 was easily audible over the Vaio when idling. It wasn't so noticeable when the laptop was stress tested, but pushing laptops to their absolute limit is a lot rarer than doing so on a desktop. I feel that overlooking the ability to change the fans was a bit of an oversight on CoolerMaster's part, as it would be very handy to simply swap over the installed fans.
The temperature results could also have been better, with only a fairly unimpressive 3 degrees being knocked off the load temperature. I feel the benefits of using the U2 would increase with a higher end laptop though, especially if you are running one of the new 45w i7 mobile chips.
I believe the U2 would be a great product, providing you are one of the following people: Someone who owns a high end i7 or gaming laptop, which runs hot (and noisy) and is used regularly for games or encoding/Photoshop. It's these sorts of applications that tend to put a lot of strain on laptops, pushing them right to the limit of their thermal capacity, and somewhere where the U2 would certainly make a noticeable difference.
Priced at £20.44 from Digital Fusion
the U2 is pretty much where you'd expect it to be, and certainly isn't undercutting competitor products significantly. If you push your laptop heavily on a regular basis, then I would suggest you take a look, as it will not only give you piece of mind that your laptop won't over heat, but it should also increase the longevity of it.
+ Fans can easily be removed and/or moved around the base of the unit.
+ Aluminium construction.
+ Sits firmly and holds your laptop nice and securely.
* Inability to change the bundled fans.
* Reduction in operating temperatures will probably only be worthwhile with high end laptops.
- Fans are far from silent.
- Used as a protective covering, the U2's protection is pretty poor.