it was my first water cooling kit so its hard to compair, but i bought it as my new X800XT was noisey (so what a 'noiser' nvidia card must sound like would drive me mad). It took me about 3 hours to fit it (being very carefull with the bits inside my oc). i had to remove the mobo too as mine is socket A and i had to bolt from the back (my case doesnt have a rear removable panel).
I didnt really do anything else apart from fit a GPu block, it didnt leak at all first time round so i booted up, it is extremely quite, to the point where i thought it wasnt working, the loudest bit on it was the flow meter which 'rattles' to show the coolant flow. Bit u want notice it. It dropped my X800XT temps down from 90 odd in games to 60 MAX now. my cpu seems to idle at 35 ish and load to about 48 after a few hours of games.
The unit is great, i wanted silence and got it (until the pump started making noises, which i have just replaced). One word of advice i can give is DONT put the top on tight, as i did and when i came to look in it one day i couldnt get it off. i had mine filled leaving about 2" of air at the top, but this time i have filled it up almost to the top, i have noticed my temps a few degrees cooler for it. i used halfords de ionized water only.