For Christmas, my step-father got for me a set of Symtec-inc grip heaters.
This was entirely coincidental. I was going to purchase some grip heaters for myself at some point but he beat me to it. The installation was fairly straight forward and I covered it all in earlier posts: Part I, Part II, and Part III.

I took my new grip heaters out for a trial run in 34F cloudy weather. It was windy, salty, and of course cold. It took a few minutes for the grip heaters to warm up and it took me much longer to get used to the feeling of warm palms. I rode for over an half hour and was still not used to them.

The short story is, they help, but they do not solve the problem.

In fact, I wonder if my fingers felt more pain due to the contrast between my warm palms and cold fingers. I did notice, however, that I retained more mobility in my fingers through the ride. In other words, my fingers didn’t get as stiff.
They were easy enough to install and were cheap enough that I am glad I have them, however I intend to get a Gerbing jacket liner and glove liner if I intend to ride all year round in the future.