I happily owned a pair of SCM50ASLs for 10 years and recently swapped them for a pair of Genelec 8361s. Same room, same source, etc. If you are interested in my subjective comparison happy to answer any questions.
Here is short summary of my experience: the Genelecs are better (no surprise!), but the SCM50ASLs were still pretty darn good monitors. I would be quite happy to keep using them if I did not have the Genelecs. They are really very, very good. They also blend into a living room fairly easily and are easy to live with.
Here is a summary of areas where I have noticed most improvement in swapping between them: (1) bass -- much clearer, more sharply defined and deeper on the Genelecs, with the freedom to position the monitors close to walls; (2) mid-range -- the ATCs certainly do this very well, but the Genelecs do it better; (3) transients -- the Genelecs are just astonishing for any time-aligned stuff, sharp transients are rendered razor sharp (to the extent that you hear every blip and pop in the recording); (4) power-handling and distortion -- the Genelecs, as well reported, go as loud as any sane person would ever want with no audible distortion; to my ears the ATCs noticeably compressed at high levels (this was most noticeable to me in big orchestral works, they never sounded quite right at proper orchestral volumes).
Anyway, yes, the ATCs are not as good as current designs. But they are still excellent monitors. There are just (even) better options out there today. I cannot comment on value for money. FYI when I bought my pair of SCM50ASLs their RRP was half their price today (and incidentally not far from what a pair of 8361s retails at today).