yeah i remember being all excited about all in one liquid cooling with some other product (just like this one) and it turns out that a $20 dollar air cooler kicked the crap out of it. All in one liquid cooling is usually absolute crap, sometimes even with a real 120mm rad attached... one of the reasons liquid cooling works is so well that it uses alot of water... as we all know, alot of water takes a long time to heat up compared to very little water... when you take into account that your all-in-one doesnt even have ONE 120MM radiator, and has a teeeeny amount of water in comparison to a real liquid system, you will begin to see how it can suck.
Also some of the air coolers here, expecially Big Typhoon and the Tuniq Tower, cool almost as well as an average water set-up. I recommend liquid cooling. I have it, and im never going back to air. But none of the reasons that liquid works (i.e. huuuge surface area cooling with radiators, takes heat outside the case, lots of liquid meaning that radiator doesnt dissipate as much heat) are present in this cooler, expect it to be very crappy.