Conclusion: Computers are insanely powerful and incredibly affordable nowadays. However, it's not without its consequences -- ten years ago, components run cool enough that a simple heatsink plus a few low RPM fans, if necessary, will suffice. Nowadays, many components will need additional cooling if you want some overclocking headroom or just to bring it to an acceptable operating temperature.
Conclusion: At just below £10, the Spot Cool is an expensive cooling option. But when you think that it can cool anywhere, it looks pretty good and it’s more or less silent, it’s a sound buy. However, it does make your PC look a little unprofessional in that a fan on a stalk isn’t the most aesthetically pleasing addition to your case. Looks or temperatures, the choice is yours.