I really like my 480SAT, I got my CW DXCC with it and a 15ft whip on my Subaru Outback! The 500Hz CW filter is a great help in crowded band. However, in a hot contest, 480 got overloaded sometimes, all signals were distorted. Last night, it must be thunder storms somewhere nearby, because signals on my 480 were distorted, but there were fine on my 590SG! I found some evidence supports my observation of the sensitivity difference. On Sherwood's radio test page, TS-590SG's sensitivity is 0.42uV, and TS-480 is 0.28uV! Both pre-amp off.