Originally Posted by
old's'cool
In C&V Heaven, there will be an encyclopedia co-written by
T-Mar and
DDDD.

I (and I suspect T-Mar) appreciate the compliments coming from Chicago!
Curiously, New 600 EX, while all-new in design, preceded the SIS era.
While certainly not the lightest 600 friction gruppo, I think of it as perhaps the pinnacle of Shimano's friction gruppos, Servo-Panta at it's very best, with robust durability, and I think newer in design than Shimano's last Dura-Ace friction gruppo.
As a serious Suntour partisan at the time, It escaped my notice. But I found a Centurion Elite RS a few years ago that was somewhat of a revelation in terms of friction shifting performance, once I updated the chain to UG Narrow (dimensionally identical to today's HG).
Oddly enough, Centurion offered bikes with both New 600EX and 600 SIS concurrently, as their prices were significantly different. The former gruppo may have had the aesthetic advantage, no? Sorry this photo isn't sharper.