I could barely tell the difference. Indexed shifting is a bunch of crap, at least when it comes to downtube shifters. I know Sheldon says it’s a “major, very worthwhile upgrade.” Far be it for me to contradict the man himself, but I don’t see what the big deal is.
Anyways, after work, I rode down to city island and up the greenbelt a ways. I got a bit lost on the way back. My guesstimate is that I rode about 15 miles.