First of all software defined filters don’t ring. Honest.
They’re really really narrow and if you don’t get the signal right in the filter’s bandwidth forget-about-it! They’re that narrow.
And with the Flex knob that locks itself onto the SDR window (unlike a mouse that works in the window it’s hovering over) and the 25Hz filters tuning across the band during a CW contest, it’s like doing your own MRI scan of the band one slice at a time. Individual signals pop in and out of the filter’s bandpass. Impressive!
During last weekend’s CQ 160 meter CW contest where everybody who is anybody in the Ham Radio contesting world crams themselves into 100 KHz or so of the band and runs as much power as they can into huge antennas, the Flex 1500 performed like a super contesting rig.
Even with Harry, VA3EC, running 360 meters north of me banging away like crazy and John, VE3EJ, whose world-class contesting station is high above me on the Niagara Escarpment, running so hard that my noise floor lifts and falls with his signal, the FlexRadio worked perfectly.