anyone using this fan speed controler?

Hi, so im building my first space bucket and thinking about speed control options of my two 120mm pc fans. I found some cheap solution on ebay http://www.ebay.com/itm/Hot-DC-1-8V-3V-5V-6V-12V-2A-Low-Voltage-Motor-Speed-New-Controller-PWM-1803B-/222101346357?hash=item33b6459835:g:KRMAAOSw2XFUmUz1 and this http://www.ebay.com/itm/DC-New-1-8V-3V-5V-6V-12V-2A-Low-Voltage-Motor-Speed-Controller-PWM-1803B-/141486696882?hash=item20f143a9b2:g:1ccAAOSwaNBUdsX8 Im thinking about connecting this controler between my two fans and 12v dc power adapter. Im no good at DIY electronic stuff, just started browsing and reading about it to build my bucket. So the question is are they any good and will get the job done? Maybe someone already using this gadget?

Well the silence suggests that nobody uses these things, so just bought power adapter with adjustable voltage

For the record that is a PWM voltage controller. It would have made your fan buzzzz as it works by turning on and off very quickly. As the voltage you set gets lower, the time "on" goes down compared to the time "off". Unfortunately the frequency of the on/off cycle is usually within our hearing range so we pick up a loud buzz from these controllers.

to slow down pc fans, just reduce the voltage, i use this,, it has a switch, you can chose the voltage and there for reduce or increase the speed of your pc fans, easy bro
http://www.ebay.com/itm/Universal-AC-DC-Power-Adapter-1000mA-1-5V-3V-4-5V-6V-7-5V-9V-12V-110-220-Volt-/261711216116?hash=item3cef343df4

Thanks loftygoals, you maybe saved me some precious time of my sleep, because that space bucket will be in my bedroom, lol. Tim Fox, i bought this one http://www.ebay.com/itm/252305865139?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT as i understand, it does the same thing and found useful plug to connect my wires to dc adaptor
http://www.ebay.com/itm/311560913091?_trksid=p2057872.m2749.l2649&var=610541225495&ssPageName=STRK:MEBIDX:IT

your on your way