There are many advantages new machines have over older analog. One is the ability to notch out items you don't want (rather than simply disc out in a linear fashion). Another is a lighter, smaller build. There are preset or saved programs for a variety of circumstances, auto tracking, ability to conduct complex timing and subtraction of multiple frequencies etc. Not that you couldn't accomplish many of these things with analog, but such a machine would be increasingly heavy, expensive to manufacture and have an unlimited amount of buttons and dials and switches. I would not wish to be banished back to the good old days of analog machines, and maybe the machine in the ad is going back a bit too far in the lineage, but there's no denying that machines like 5900di SL Pro still have a place in the hobby for the power and quality of their signal, and the preciseness of their adjustments. I still play around with models like that and I've been struck at how effective, fast and deep they are if you get everything tuned in just right. Digital has many advantages, but in some ways is just mimicking or approximating some of what analog machines do.