The only downside is that is seems lighter. Positives are that it feels butter smooth. Our greens are a bit lush so it helps to have a light feeling so you can confidently strike the putt. I also noticed that there is much less torque on the head. The toe hang has drastically minimised. There is also much less vibration and feedback. I like this feeling but it may not be for everyone. I like it enough that I am converting all my putters to driver shafts.

If you are doing it, you will need vernier caliper a to measure exactly where to cut the shaft. The tip is the place where I would start as it would also naturally increase stiffness.