Yes. We did a phased rewrite of our product, replacing the underlying data structure and networking code, and then working our way up to the UI. It took 8 mont

Yes. We did a phased rewrite of our product, replacing the underlying data structure and networking code, and then working our way up to the UI. It took 8 months, lots of pain and arguments over architecture, lost some employees, and the result was a solid product of beautiful code that sold no better than the old version. We abandoned it 2 years later after our new product launched. tl;dr: even when it succeeds, it's a colossal waste of time.