I am about the same temps as Doc has. I like mine a lot, except it does take a lot of room in the case.
There is a temperature control card that comes with the unit, can't remember what it's called atm. But you can set that so your temps do not go below ambient temps. I run my at stock and have not adjusted that card at all and everything is groovy.
They are far from worthless and do a pretty darn good job of cooling your CPU even if you OC. If you are a extreme OCer then there are better solutions, but other than that they work just fine.