I recently purchased the PC5750 to replace my PC5740. While being sold on the specs by the local salesman, i was expecting it to be much faster than the previous model. In my home in Key West, Florida i noticed a slight boost in performance, but not nearly as much as the commissioned salesman had sold me on. But to me the defining quality feature that the PC5750 has vrs the PC5740 is the external antenna jack "not the flip up antenna" that i am using in order to amplify the signal and pull much more bandwidth than the previous model. So in short the card it's self is only slightly better than the previous models but when boosted by a separate external antenna, it is very impressive.