I do not normally use finger inserts. Recently, I drilled a couple balls with finger inserts and have noticed some interesting side effects, some I like, and some I do not like. My conclusion so far... it seems that there is a trade off. More power and better pin carry for less consistency in my release thus less accuracy at the pins.
On house conditions, it seems there the difference is nominal, but on flatter conditions it seems to be more obvious.
I am looking for others that have made the change, or attempted to do so, and hearing about your experiences. I am about ready to give up on them as I am not convinced there is a real advantage for me in using them.
To quote a famous Fox commentator, "What say you?"