Funny, my Trek 1200 came with STI shifters. Fantastic, though a little hard to adjust for precision. Point being, one morning on the way to work, on the bottom of perhaps the tallest climb (you know how those planners make roads, straight up and over every hill) one of them "malfunctioned." By a miraculous event, it continued to work for me, if I fiddled with it just right, and I got to work (late.)

But (...but...) it finally self-destructed. The replacement cost was
a little high (over 100 smacks) so I Frankensteined my Giant mountain bike's handlebars, grip shifters and cables onto the Trek.

Lost three speeds, but I don't miss them. In fact, I don't miss my STI's either. The grip shifters are so forgivable when it comes to adjusting for precision, I often wait until they are way out before tuning them.

(Lazy-Boy.)