I've had a few different configurations for the shifter in the 10th gen civic SI. by far the best and most rewarding one is this rocker upgrade, the Acuity upgraded spring, connected to a 10 gen CTR shifter. The ease of shifting is absolutely outstanding. The rocker arm gives you a very tight and precise gear selection. The reduction in spacing I find matches the short gear ratios but better and encourages you to shift for any and every reason. This rocker on the 10th gen civic Si shifter vs the CTR shifter feels about the same.
I think it's safe to say, if Acuity shifter upgrades are just good and they just work.
Installation was also very easy
Quality materials, perfect fit