I recently sold my W126 and W123 in favor of a W140...Let me just say that I miss my W126 already (not the 123 tho, sorry guys! )...I still haven't formulated a specific opinion on what I think about the W140 as a whole, but I feel that the W126 is probably the better car, overall...

It seems like Mercedes had something different in mind when they designed the W140 than the W126, like they were more focused on being the most advanced, rather than quality and longevity (just my opinion, could be wrong).

So far my W140 has been trouble free, aside from the nightmarish Bose stereo (what you've heard is true...LOL) Definitely handles better than the W126, but doesn't feel as smooth or as solid (purely subjective)

Anyway, that's my abbreviated W140 comparison to the W126...

Feel free to interject!

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Current cars:
2000 ML55 AMG, 174k miles
2003 C240 T-Modell, 202k miles
1995 S320, 207k Miles