I love my STI shifters, however one of the downsides I've experienced is that they're not as easy to self-service compared to the old downtube shifters. I suppose increased functionality usually means increased complexity. Also, if you have cable stretch, it used to be so easy to just put the downtube shifters in friction mode and continue to go. With STI shifters, I have a hard time making micro-adjustments on the fly.