I used to use the flip-chip on my YT Jeffsy quite a bit. On long days with lots of pedaling no really gnarly descents, I appreciated the slightly higher bb (fewer pedal strikes) and steeper seat tube. Although at this point I have installed shorter cranks which helps with the latter problem, and I have slid my seat all the way forward for the former. In the end, the flip chip does not make a massive difference. Also, these days there are always a few steep descents thrown into any ride. So now I just flip the chip when I’m going out for a rides which I am certain will not feature steep descents.