33 CFM is terribly low for a case fan; though it has fairly descent static pressure for a 120mm. I guess it really depends on what you're system is. I probably wouldn't use these things if my system ran too hot as it wouldn't move enough air. Though if my system was already fairly cool i probably could put this on a radiator since the static pressure is high.
directassaultAgreed, the Scythe Ultra Kaze 3000RPM @ 133CFM for $13 each is a much better deal than these, The Ultra Kaze 3000 even provides greater static pressure (3mm H2o).