I have some Tiagra on my Jamis and it is FINICKY. I desparately want to be rid of it. I can't decide what to do yet. May get something else - may upgrade. I can't decide right now. I'm giving it 6 months or so. Just to be fair to Jamis and for my personal well-being. I can't stand losing money - I thought I was saving money getting this bike - it hasn't worked out that way - componentry is important. Listen to Catriona, I say.