I was concerned when I bought these of how well the heating feature would work...no worries! It did take a little longer for the grips to heat up due to the extra material, but it was not much longer and the heat was the same level as in the past.
Installation was VERY easy and took less than 10 minutes to put both one. The extra diameter of the grip is great for me as I have relatively large hands, however, if you have small hands, you might find them too big. They really eliminated the cramping that I would occasionally suffer from on longer rides.