Summary: The hole for the screws to go in aren't threaded, so you really have to force the screws to go in all the way. Also a bit of a pain that there was no indication as to which way the fan spins without plugging it in first. I installed it on the empty fan slot on my cheap-and-cheerful case, and it keeps my components 4 or 5 degrees cooler than without it, which was all I needed. So for 6 quid, I'm fairly happy with it.
Summary: Over priced fan that comes with 4 screws that won't fix into it and no indication to the direction of air flow. Sorry that I bought it and will return it to DABS. It also comes with an extra 2-to-4 caple connector that has a female 4 pin socket that is useless because it won't connect to psu and needs an extra female/male 4 pin converter. I lost about one hour of my precious time trying to fix this thing into the PC box ... in vain.
Summary: This is a decent enough quiet fan. Okay there's no indication of airflow direction, but it takes just a moment with it plugged in to the power to confirm the direction. The reason for the ease of use score being so low is becuase of the crap self-tapping screws they supply. The screw head lost it's cross with a few tries of a screwdriver (usually about halfway in!), which meant I had to use a screw extractor to get the damn things out again.
Summary: I used the screws that came with my new case to fit this, so i guess i was lucky i didn't have to use the crappy self tappers that come with this fan. In it's defense though, the actual fan seems of very high quality and also looks nice.