Microshifts gets mixed reviews. A discerning friend has it and likes it just fine. I wouldn't be afraid. I write this for the record, knowing that you've solved this problem. I might face it, too. I have the previous Tiagra on my bike, a 3x9 drivetrain. The rear shifter is less eager to shift to higher gears (smaller cogs) but I suspect a cable change will fix this. But I still ran through all the various machinations, many of which are expensive.