If ever there was a good application for electronic shifting it’s TTing. eTap just rocks.
Prior to eTap I was frustrated with friction shifting and was really happy with SRAM R2C. When you are on the rivet with friction shifting it seemed like I let up trying to feather the derailleur. R2C you can hit it and forget it. Anyway, I thought it was a step in the right direction and would recommend it.