Love them, just re-installed on my '95 Merlin.
Pros: low friggin maintenance, I think I've had the same cables on my '82 Bianchi for 20 years. They work well and make you better appreciate the gear you're in (really, 9 is too many). They look sleek and simple. Be the life of the party, amaze the young kids.
Cons: mine still pull the front dérailleur down into a rub condition (or worse, a shift) when really honking out of the saddle in the big ring. Gotta remember to crank down the d-ring, but even then. I wish the left lever had a detent. Anybody have a cure for this?
PS the Bianchi has Simplex retrofrictions (like butter, but not enough cable pull for newer setups) and the Merlin has Campy Syncro 2 9v via Mr. Fixedinwinter.
Not a world-class surfer, Emmy-winning writer and director, or tea merchant.
Just a guy who likes riding bikes, as fast and as often as I can.