Not trying to pile on, but speaking for myself, one reason SDR will probably never come into my shack is that I'm kind of dense about electronics and pull the cover off a SDR box and look inside and what I see is a lot of stuff I have no idea about, will never be able to repair, and can't understand. One of the big reasons I got into AM was that I could sort of understand and fix the tube gear. I have plastic radios from my slopbucket days and they are largely mystery boxes which I use less and less. SDR would be another black box and I'm trying to get away from that. My hat is off to the few who can figure them out and work on them and fix them, ditto for the plastic radios, but every time I ask a SDR op to tell me how his rig works, what's inside, etc., he never replies and instead wants to talk about what his rig can do not how it works, his leenyar, or lawn care or something else.